Five species of the genus Cheilolejeunea are reported from Hong Kong. Among them, Cheilolejeunea osumiensis (Hatt.) Mizut. and Cheilolejeunea ryukyuensis Mizut. are new to China. Cheilolejeunea intertexta (Lindenb.) Steph. is newly reported for China except Taiwan, and Cheilolejeunea trifaria (Reinw. et al.) Mizut. is documented for the first time for mainland China except Hainan and Taiwan. The detailed description and illustration of Cheilolejeunea osumiensis as well as the key to the five Cheilolejeunea species of Hong Kong are also presented

So, M.L.

Zhu, R.L.

English

Hochschulschriftenserver - Universität Frankfurt am Main

5Tropical Bryology 12:5-10, 1996Studies on Hong Kong Cheilolejeunea with two species newto China.M. L. SoBiology Department, Hong Kong Baptist University, 224 Waterloo Road, Hong Kong.R. L. ZhuDepartment of Biology, East China Normal University, 3663 Zhong Shan North Road,Shanghai 200062, China.Abstract.  Five species of the genus Cheilolejeunea are reported from Hong Kong.  Among them,Cheilolejeunea osumiensis (Hatt.) Mizut. and Cheilolejeunea ryukyuensis Mizut. are new to China.Cheilolejeunea intertexta (Lindenb.) Steph. is newly reported for China except Taiwan, and Cheilo-lejeunea trifaria (Reinw. et al.) Mizut. is documented for the first time for mainland China except Hainanand Taiwan.  The detailed description and illustration of Cheilolejeunea osumiensis as well as the keyto the five Cheilolejeunea species of Hong Kong are also presented.Cheilolejeunea is a large and diverse genus inLejeuneaceae.  Most of the species in this genusare distributed in the subtropical and tropicalregions while only a few species extend into thetemperate regions.  This genus can be recognizedby (1) the imbricate leaf-lobes whose margin isentire, (2) the two-lobed underleaves and bracteo-les, (3) the ovate or rectangular leaf-lobules whoseapex bears an angular tooth consisting of 0-7uniseriate cells, (4) the absence of ocelli in the leaf-lobe, (5) the obovate perianths with 3-5 smoothkeels, (6) the hyaline papilla occurring on the distalside of the angular tooth of the leaf-lobule and (7)the 1-3(-5), large, grape-clustertype oil bodies per leaf-cell.  In Hong Kong theonly genus which may be confused with Cheilo-lejeunea is Lejeuna, but that often has small oil-bodies, and a hyaline papilla proximal to the apicaltooth.In the past, the Cheilolejeunea flora of HongKong was poorly known, and only one species,Cheilolejeunea imbricata (Nees) Hatt., was re-ported by But and Gao (1991).  Based on our recentsurvey of bryophytes, 5 species of Cheilolejeuneaare present, even though Hong Kong is very smallin its area (only 1062 km2).  These species can beseparated by the following key.Key to species of Cheilolejeunea in Hong Kong61.Innovation leaf sequence lejeuneoid; leaf-api-ces flat to incurved............................................21. Innovation leaf sequence pycno-lejeuneoid;leaf-apices flat...................................................32. Male bracteoles restricted to the base of theandroecium; apices of leaf-lobes rounded; oilbodies 2-3 per leaf-cell, spherical to elliptical.................................................................C. trifaria2. Male bracteoles present throughout theandroecium; apices of leaf-lobes obtuse to acute;oil body 1 per leaf-cell, cashew-shaped....................................................................C. osumiensis3. Leaf-lobule more than 1/2 the length of the leaf-lobe; plants large, usually 1.5-2.1 mm wide withleaves C. imbricata3. Leaf-lobule less than 1/3 the length of the leaf-lobe; plants small, less than  1.4 mm wide withleaves ..............................................................44. Leaf-lobe orbicular; underleaf bilobed to 1/3-1/2,entire at margin; angular  tooth  of the  leaf-lobule1-celled, sometimes indistinct; plants 0.5-0.7 (0.8)mm wide with leaves ..C. intertexta4. Leaf-lobe oblong; underleaf bilobed to 1/2-3/5;more or less wavy at margin; angular tooth of theleaf-lobule indistinct; plants 0.9-1.4 mm wide withleaves..................................C. ryukyuensis1. Cheilolejeunea imbricata (Nees) Hatt.Local plants are extremely variable not only in sizeof plant and structure of stem but also in shape andstructure of leaf-lobule.  The leaf-lobules may bebroadly to narrowly rectangular, the angular toothof leaf-lobule triangular to linear (0-4 cells long and1-2(3) cells wide at base), and the median tooth ofleaf-lobule is usually absent, occasionally angularand blunt.  In most local collections the stem hasonly 8-15 rows of epidermal cells, and the ventralmerophyte may range from 2 to 4 cells in width.In Hong Kong C. imbricata commonly occurs ontree-bark, rock surfaces and living leaves.  Thisspecies is the most common member of the genusCheilolejeunea in China.  Until now, it has beenknown from Anhui, Fujian, Guangdong, Guizhou,Hainan, Taiwan, Xizang and Yunnan (Piippo 1990),and Zhejiang (Zhu et al. 1994a, 1994b).  Accordingto Thiers (1992), the total range of this species nowincludes Southeast Asia and the islands of theSouth Pacific.Specimens examined - Hong Kong, Tai Mo Shan,So 95109; Yung Shue O, So & Zhu 94727L46.(HKBU-Baptist University Herbarium, HSNU).2. Cheilolejeunea osumiensis (Hatt.) Mizut. (Fig.1)This species was first described as Eusomolejeu-nea osumiensis by Hattori (1944).  Mizutani (1961)reduced  it to a synonym of Cheilolejeuneaontakensis (Steph.) Hatt.   Later, Cheilolejeuneaosumiensis (Hatt.) Mizut. was revived by Mizutani(1980) in accordance with the male bracteolesoccurring throughout the androecium.  Localmaterial basically agrees with Hattoris originaldescription as well as that of Mizutani (1982)except for some characters such as shape of oilbody and size of plant.  The following is a detaileddescription and illustration of this species, basedon living, field-collected material from Hong Kong.Autoicous, plants yellowish green, up to  15 mmlong, 0.6-1.46 mm wide with leaves, growingappressed to tree-bark, rock and decaying logs,sometimes loosely on some mosses.  Stems 0.08-0.1 mm in diameter, irregularly branched, transver-se section of stem 5-6 cells in diameter, corticalcells 7(8), oblong or quadrate, thick-walled, about2432 m, medullary 7-10 in number, about 1/6-1/3 thecortical cell in size.  Rhizoids numerous, fasciculate,from the base of the underleaf.  Leaves imbricate,horizontally to obliquely spreading, leaf-lobeslightly falcate, oblong-ovate, 0.63-0.70 mm longand  0.43-0.49 mm wide, margin entire, apex obtuseor acute, usually incurved, marginal cells 12-168-12 m, median cells 14-2116-26 m, trigones small tomoderately large, walls thin, intermediate7Fig.1. Cheilolejeunea osumiensis (Hattori) Mizut. - a. Portion of sterile plant, ventral side.  - b.Portion of plant with a male inflorescence, ventral side.  - c. Elater.  -d. Female bract.  -e. Femalebracteole.  -f. Female inflorescence, ventral side.  -g. Transverse section of perianth.  -h. Apex ofleaf-lobule.  -i. Median cells of leaf-lobe, showing oil bodies.  All from So & Zhu 95428L3.  Scales:D=0.025 mm (c,h,i).  E=0.5 mm (a).  F=0.4 mm (b, d-g).8thickenings absent, basal cells 26-3016-26 m, vittacompletely absent, cuticle of leaf smooth or slightlymammillose.  Leaf-lobule ovate, strongly inflated,free margin somewhat inrolled, about 1/5-1/3 as longas the leaf-lobe, apex constricted, angular tooth1(2) cells long, keel straight or slightly arched.Underleaves usually remote, 2-4 times as wide asthe stem, orbicular, 0.18-0.32 mm long and wide,bilobed to about 1/3 the length, sinuses narrow orobtuse, insertions sinuate.  Oil bodies in the cellsof leaf and perianth wall 1 per cell, cashew-shaped12-214-5.3 m, of the grape-cluster type, globulessmall, 0.6-2(3) m in diameter, oil bodies in the cellsof stem epidermis 1-6 per cell, elliptical or cashew-shaped, 4-610-14 m.  Androecium  on long branch,usually with or without apical innovation,sometimes lateral on stem with apical innovation.Male bract (2)4-5(9) pairs, closely imbricate, about0.3 mm long and wide, bract-lobule ovate, about 2/3-3/4 as long as the length of bract-lobe, apex roundor truncate, bracteoles occurring throughout theandroecium, 0.18-0.21 mm long and wide.Gynoecium usually on a long branch, innovationleaf sequence lejeuneoid, with 1-2 subfloralinnovations, bract-lobe oblong-ovate, 0.56-0.65mm long and 0.24-0.33 mm wide, bract-lobule oblongor linear, 0.25-0.31 mm long and 0.074-0.083 mmwide, bracteoles about 0.66 mm long and 0.33 mmwide, slightly bilobed.   Perianth obovate, 0.58-1.1mm long and 0.41-0.72 mm wide, 5 keeled, dehiscingfrom the apex downward by 4 valves when mature.Elaters linear, 8 per capsule in number, withsinuately-thickened walls, about 0.19 mm long and17 m wide.  Seta articulate, about 0.9 mm long(usually with 11 articulations).  Spores not seen.Hattori (1944, 1951) illustrated and described theoil body of this species, based on Japanese mate-rials.  According to his original illustration (1994),the oil body is elliptical to oblong, 1-3 per leaf-cell.However from his description and illustration in1951, the oil body is mulberry-shaped,  about  2010m  or  18-217 m, 1-2 per leaf cell.  After examininga lot of living materials, the oil body was found tobe cashew-shaped, always 1 per leaf-cell.  ObviouslyCheilolejeunea osumiensis can easily bedistinguished from other members ofCheilolejeunea in Hong Kong by the uniqueshape of the oil body.Cheilolejeunea osumiensis closely resembles C.khasiana (Mitt.) N. Kitag., which is known fromHunan, Shangxi and Yunnan (Piippo 1990), Sichuanand Zhejiang (Zhu 1992, unpubl.) in China.  Thetwo species have the following features in common:(1) the ovate lobes whose apex is acute or obtuse,and usually incurved, (2) the small, ovate leaf-lobule with a small angular tooth, (3) the small tomoderately large trigones of leaf-cells and (4) theslightly bilobed underleaves.  However, C.khasiana differs primarily from C. osumiensis inthat the male bracteoles are present only at thebase of androecium, and the perianth bears 2-3keels.Cheilolejeunea osumiensis, new to Hong Kongand China, was previously recorded only fromJapan.  The range of this species has nowextended considerably southward.  In Hong Kong C. osumiensisusually occurs in large patches on rocks, tree-barkand decaying logs, but it may sometimes beassociated with Lejeunea flava.  This speciesappears to be rare because it was found at onelocality cited below.Specimens examined. - Hong Kong, Tai Mo Shanpeak, 950m.  So & Zhu 95428L3, 95425L12 (HKBU,HSNU).3. Cheilolejeunea trifaria   (Reinw. et al.) Mizut.Local plants are relatively small, usually 0.7-0.8 mmwide with leaves.  The oil body of this species is2-3 per leaf-cell, round or elliptical, 6-16 m indiameter or 10-16  4-6 m.  Because the underleavesmay vary in size and shape, some poorly developedplants are easily confused with Cheilolejeuneaintertexta.  But, C. trifaria is readily separatedfrom the latter by (1) the deeply sinuate insertionof underleaf, (2) the more or less incurved apex ofleaf-lobe, (3) the shortly bilobed underleaves, (4)the scarcely branched stem and (5) the largetrigones of leaf-cells.  Furthermore, one essentialdifference lies in their innovation leaf sequence.Cheilolejeunea trifaria has lejeuneoid innovationsequence, whereas that in C. intertexta is9pycnolejeuneoid.Cheilolejeunea trifaria is a rather uncommonspecies in Hong Kong, previously reported inChina only from Hainan (Lin et al. 1992) andTaiwan (Mizutani 1972).  Locally this speciesgrows on rock together with several moss species,but occasionally also on living leaves.  The knownrange of this species now includes Africa, BoninIs., Borneo, Ceylon, Java, New Guinea, Philippines,Ryukyu, Sumatra, South and Central America,Tahiti, Thailand (Mizutani 1982), and China.Specimens examined. - Hong Kong, Tai Mo Shan,So 951092; (HKBU, HSNU); North of KadoorieGarden, So & Zhu 95501L9 (HKBU, HSNU).4. Cheilolejeunea intertexta (Lindenb.) Steph.Although the present species is one of the com-mon species of the genus Cheilolejeunea in mosttropical regions, it is apparently uncommon inHong Kong.  In local material the angular tooth ofleaf-lobule varies greatly.  In most specimens itconsists of only 1 cell, but sometimes completelyabsent or indistinct.  Locally C. intertexta usuallygrows on tree-bark and rock in partial shade at lowaltitude, and usually forms a large mat on thesubstrate.  This species is here reported for thefirst time for China except Taiwan.  Outside China,it is known from Africa, Amboina, Ceylon, Japan,Micronesia, Philippines, Samoa, Sumatra and Tahiti(Mizutani 1982).Specimen examined. - Hong Kong, Saikung, So &Zhu 95418L6 (HKBU, HSNU).5. Cheilolejeunea ryukyuensis Mizut.This species is relatively common in Hong Kong,usually found on living leaves and tree-bark inshaded habitats.  Local material agrees withMizutanis original description.  The oil body iswell developed, elliptical, 6-1616-29 m, 2-3 per leaf-cell.  Cheilolejeunea ryukyuensis is easilyconfused with C. intertexta, and the differentia-tion between extreme forms of the two species canindeed be very difficult.  Cheilolejeunea intertextacan be separated from C. ryukyuensis by the moreor less falcate, orbicular leaves, and the smaller,slightly bilobed underleaves whose lateral marginis not undulate.Cheilolejeunea ryukyuensis is newly reported forHong Kong and China.  The known distribution ofthis species now includes Japan (Mizutani 1982)and Hong Kong.Specimens examined. - Hong Kong, Tai Lam Wu,So & Zhu 94802L11 (HKBU, HSNU); Tai MoShan, So 941228L15 (HKBU, HSNU).AcknowledgmentsThis research was supported by a grant from the HongKong Baptist University for which the authors are grateful.ReferencesBut, P.P.-H. & Gao, C.-H. 1991.  Epiphyllous Hepaticaeof Kowloon Peninsula (Hong Kong). TropicalBryology 4:17-22.Hattori, S. 1944. Contributio ad Floram HepaticarumAustro-Kiushiuensem.  Bull. the Tokyo Sci.Mus. 11:1-203.Hattori, S. 1951.  Oil bodies of Japanese Hepaticae (1).Hattori Bot. Lab. 5:69-97, f.1-48, p1. 1-7.Lin, P.-J., Piippo S., Koponen T. & Wu P.-C., 1992.Bryophyte flora of Jianfengling  Mts., HainanIsland, China.  Bryobrothera 1:195-214.Mizutani, M. 1961.  A revision of Japanese Lejeuneaceae.J. Hattori Bot. Lab. 24:115-302.Mizutani, M.  1972.   Studies of little known Asiaticspecies of Hepaticae in the Stephani Herbarium7.  Some little known species of the subfamilyLejeuneoideae of the Lejeuneaceae.  J. HattoriBot. Lab. 35:399-411.Mizutani, M.  1980.  On the Cheilolejeunea ontakensis.Misc. Bryol. Lichenol. 8(7):146-149.Mizutani, M.  1982. Notes on the Lejeuneaceae 6.Japanese species of the genus  Cheilolejeunea.J. Hattori Bot. Lab. 51:151-173.10Piippo, S. 1990.  Annotated catalogue of Chinese Hepaticaeand Anthocerotae.  J. Hattori Bot. Lab. 68:1-192.Thiers, B.M. 1992.   A  re-evaluation  of Cheilolejeuneasubgenus Xenolejeunea.  Tropical Bryology5:10-21.Zhu, R.-L., Ye, L.-X. & Cai, H.-Z..  1994a.  Epiphyllousliverworts of Fengyangshan Nature Reserve,Zhejiang Province, China.  The Bryologist97:277-279.Zhu, R.-L., Ye, L.-X., Lai, H.-Z., Hu, R.-L. & Zhang,G.-Z. 1994b.   Epiphyllous liverworts fromBaishanzu Nature Reserve, Zhejiang Province,China.  Hikobia 11:543-547.

A re-evaluation of Cheilolejeunea subgenus Xenolejeunea.

A revision of Japanese Lejeuneaceae.

Annotated catalogue of Chinese Hepaticae

Bryophyte flora of Jianfengling Mts.,

Contributio ad Floram Hepaticarum Austro-Kiushiuensem.

Epiphyllous liverworts from Baishanzu Nature Reserve,

Epiphyllous liverworts of Fengyangshan Nature Reserve,

Oil bodies of Japanese Hepaticae (1).

On the Cheilolejeunea ontakensis.

Studies of little known Asiatic species of Hepaticae in the Stephani Herbarium 7. Some little known species of the subfamily Lejeuneoideae of the Lejeuneaceae.

Studies on Hong Kong Cheilolejeunea with two species new to China

Studies on Hong Kong Cheilolejeunea with two species new to China

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