Conjugacy separability and outer automorphism groups of certain HNN extensions

AbstractIn this note we first establish a criterion for the conjugacy separability of HNN extensions of polycyclic-by-finite groups with central associated subgroups. Using this result, we prove the equivalence of residually finiteness and conjugacy separability in these HNN extensions. Then we prove that the outer automorphism groups of these HNN extensions are residually finite if the HNN extensions themselves are residually finite

Studies on Schismatoglottideae (Araceae) of Borneo XXXIV – The Fruits of Schottariella mirifica

The fruits of Schottariella mirifica P.C. Boyce & S.Y. Wong are described and illustrated for the first time and shown to be dehiscent berries, the second recorded example of this fruit type for tribe Schismatoglottideae, and the third for the family Araceae. The berries of Schottariella mirifica dehisce basally with the shed portion of the berry containing 3–5 comparatively large seeds, each fully enclosed in a fleshy white aril

Bronchiolitis Obliterans Organising Pneumonia (BOOP) in a lung cancer patient after lobectomy

A 79 year-old patient with lung cancer underwent a standard thoracotomy and lobectomy. Postoperatively, he developed low-grade fever and dyspnoea. Chest X-rays showed progressive lung infiltrates, which was subsequently diagnosed to be Bronchiolitis Obliterans Organizing Pneumonia (BOOP) by transbronchial lung biopsy. He responded well to corticosteroid therapy. The case report is followed by a brief discussion on BOOP in association with lung cancer and thoracotomy

Studies on Schismatoglottideae (Araceae) of Borneo XXIX - Piptospatha manduensis-The Ultimate aroid calciphile ?

Piptospatha manduensis A. Hay & Bogner is highlighted as a truly calciphilous aroid obligated to travertine in north eastern Indonesian Borneo. Based on new collections and cultivated plants an updated description is offered. A brief overview of the other very few calciphilous aroids in Borneo is presented, and together with P. manduensis, all are illustrated

Studies on Homalomeneae (Araceae) of Borneo XV: A Novel Limestone-Obligated Homalomena from SW Sarawak, Malaysian Borneo

Homalomena selaburensis P.C.Boyce & S.Y.Wong is described as a taxonomic novelty of the Homalomena Supergroup from forested Karst limestone in Samarahan Division, SW Sarawak, and compared with the most similar species described so far from Sarawak (Homalomena passa S.Y.Wong & P.C.Boyce), and from Peninsular Malaysia (Homalomena curvata Engl.). An identification key is provided and Homalomena selaburensis is illustrated from living plants

Studies on Schismatoglottideae (Araceae) of Borneo LVIII : Further novelties described for the genus Piptospatha, and a note on Piptospatha Sect. Gamogyne

Piptospatha bella S. Y. Wong & P. C. Boyce and Piptospatha lurida S. Y. Wong & P. C. Boyce are described and illustrated from Sarawak, Malaysian Borneo. Their recognition takes Piptospatha to 18 described species. Piptospatha lurida is most similar to P. burbidgei, a species formerly allotted its own genus, Gamogyne, later made into a section of Piptospatha. Notes on Gamogyne are provided and a correction to published information on the placentation of Gamogyne offered

Schismatoglottideae (Araceae) of Borneo XIX — Piptospatha pileata, a remarkable new species from Kalimantan Timur, Indonesian Borneo

Piptospatha pileata, a new species of the Araceae tribe Schismatoglottideae from Kalimantan Timur province, Indonesian Borneo, is described, comparatively illustrated and delimited from P. burbidgei and P. elongata, and included in a revised key to the species of the genus

The Araceae of Indomalaya I: Piptospatha N.E.Br.

A review of the genus Piptospatha N.E.Br. is presented with new generic boundaries implemented since the last full revision. 10 species are recognized, two of them (P. marginata (Engl.) N.E.Br. & P. repens H.Okada & Tsukaya) recognized only recently as distinct species. Two species (P. angustifolia Engl. ex Alderw. and P. remiformis Ridl.) are treated as inadequately known. A key to accepted species is given, and all species are illustrated, the majority from living plant

Studies on Schismatoglottideae (Araceae) of Borneo XXXIV — Schismatoglottis iliata, a new species from NW Sarawak, and notes on the Schismatoglottis Multiflora Group and the Schismatoglottis mayoana Complex

A summary of the Schismatoglottis Multiflora Group of Hay & Yuzammi is presented and the group shown to comprise about 15 species, including that described here. Schismatoglottis iliata P. C. Boyce & S. Y. Wong is described as a taxonomic novelty from forested sandstone riverside bluffs of the Ulu Batang Kayan, Lundu District, Kuching Division, NW Sarawak, Malaysian Borneo, and compared with the morphologically most similar species, S. mayoana Bogner & M. Hotta and S. nicolsonii A. Hay, with which S. iliata shares leaf blades adaxially matt olive green and abaxially with very fine and dense (c. 2 veins per mm) pellucid secondary venation, and stamen thecae each with two pores. A key to this newly recognized S. mayoana Complex is provided, and all described species for the S. mayoana Complex are illustrated