Malmidea incrassata Kalb 2012, sp. nov.

Abstract

Malmidea incrassata Kalb sp. nov. (Fig. 2G) Mycobank MB 564182 Sicut Malmidea vinosa (Eschw.) Kalb, Rivas Plata & Lumbsch, sed ascosporis cum parietibus apicalibus incrassatis et atranorino producente differt. Type:— BRAZIL. São Paulo: Serra do Mar; Serra do Garrãozinho between Moji das Cruzes and Bertioga, in a very humid and dark primary rainforest (Mata Atlântica), 850 m, 23°45’ S, 46°10’ W, 29 March 1980, K. Kalb & G. Plöbst (holotype SP, isotype hb Kalb 21130). Etymology:—The specific epithet refers to the thickened end of the ascospores. Thallus crustose, corticolous, continuous, 100–180 µm thick, ± smooth or wrinkled, dull to slightly shiny, without warts, grey to green-grey, soralia and isidia absent. Medulla white, KOH-. Photobiont chlorococcoid, cells 6-8 µm in diameter. Apothecia sessile, rounded, 1–1.8 mm diam. and 0.4–0.5 mm high; disc plane to slightly concave, brown-grey to dark ochre; margin of piperis - type, thin, 100–200 µm thick, slightly prominent, whitish grey to dark grey, black when wet. Outer part of the exciple (30–50 µm) hyaline, internally brown to dark brown 100–200 µm thick, without a medullary layer or hydrophobic granules. Hypothecium 140–160 µm high, brown, KOH-. Epihymenium indistinct. Hymenium 80–100 µm high, hyaline. Asci 50–60 × 13–18 µm, (4–)6(–8) spored. Ascospores non-septate, wall unequally thickened, i.e. more thickened at both ends (or only one end), halonate, ellipsoid to fusiform, 12–17 × 6–10 µm, halo 1.5–2 µm thick. Chemistry: atranorin (major to trace) and a triterpene (major) with relative R f -values 73, 82, 88 in solvents A, B’, C (Elix & Ernst-Russell 1993). Notes:—The new species is very similar to Malmidea vinosa, but that species differs in having ascospores with uniformly thickened walls and lacks secondary lichen products (holotype tested). Additional material examined: — BRAZIL. São Paulo: Serra do Mar; Serra do Garrãozinho between Moji das Cruzes and Bertioga, in a very humid and dark primary rainforest (Mata Atlântica), 850 m, 23°45’ S, 46°10’ W, 28 October 1978, K. Kalb & G. Plöbst (hb. Kalb 37864). — Serra do Mar; Serra de Paranapiacaba, ca. 80 km SW of São Paulo, in a light and humid rainforest (Mata Atlântica), along the Rio Juquiá, 700 m, 24°00’ S, 47°20’ W, 28 March 1978, K. Kalb & G. Plöbst (hb. Kalb 37808). — Ilha Comprida opposite Cananéia, in a dense and very humid coastal forest not subject to flooding (restinga), 3 m, 25°00’ S, 47°50’ W, 15 July 1979, K. Kalb (hb. Kalb 21134).— Rio de Janeiro: Serra da Mantiqueira; Itatiaia, Parque National do Itatiaia, in a humid and dark primary rainforest (Mata Atlântica), 800 m, 22°20’ S, 44°35’ W, 21 July 1978, K. Kalb & G. Plöbst (hb. Kalb 38972). — Serra da Mantiqueira; Itatiaia, Parque National do Itatiaia, in a humid and dark primary rainforest (Mata Atlântica), 1100 m, 22°20’ S, 44°35’ W, 21. VII. 1978, K. Kalb & G. Plöbst (hb. Kalb 38973).Published as part of Kalb, Klaus, Buaruang, Kawinnat, Mongkolsuk, Pachara & Boonpragob, Kansri, 2012, New or otherwise interesting Lichens. VI, including a lichenicolous fungus, pp. 35-47 in Phytotaxa 42 on pages 41-42, DOI: 10.11646/phytotaxa.42.1.5, http://zenodo.org/record/489482