Pseudoastrosphaeriella papillata (K.D. Hyde & J. Fröhl.) Phook. & K.D. Hyde
Basionym: Astrosphaeriella papillata K.D. Hyde & J. Fröhl., Sydowia 50(1): 109 (1998)
Index Fungorum number: IF551646; Facesoffungi number: FoF 01238
Holotype: IFRD 8704
Etymology: from the Latin papillata, in reference to the long necks.
Saprobic on submerged bamboo, visible as numerous, raised, black, dome-shaped, with spike-like structures in dark area on host surface. Sexual morph: Ascostromata 300–430 μm high (excluding neck), 550–820 μm diam., black, scattered, solitary to gregarious, immersed in host cortex, becoming raised, erumpent through host tissue by papilla, hemisphaerical or depressed conical, flattened at the base, uni-loculate, glabrous, coriaceous, ostiolate. Neck 490–800μm high, 120–150 μm diam., central, cylindrical, oblique to curved, single, rarely furcate at the apex, brittle, carbonaceous. Peridium 10–130 μm wide, of unequal thickness, thick at the sides towards the apex, composed of small, hyaline to dark brown or black, pseudoparenchymatous cells, outer layers comprising host cells plus fungal tissue, arranged vertically in a textura angularis to textura prismatica, poorly developed at the base, with palisade-like cells at the rim. Hamathecium composed of dense, 0.7–1.5 μm wide, filiform, trabeculate pseudoparaphyses, anastomosing at the apex, embedded in a hyaline gelatinous matrix. Asci (130–)135–165(–172) × (15–)17–20(–22) μm (x̄ = 152.6 × 18.2 μm, n = 25), 8-spored, bitunicate, fissitunicate, cylindric-clavate, with slightly furcate, rounded pedicel, apically rounded, with indistinct ocular chamber. Ascospores (29.5–)30–40(–45) × 6–8(–9.5) μm (x̄ = 38.4 × 8 μm, n = 30) overlapping uni- to bi-seriate, yellowish brown to grey brown, broadly fusiform to clavate, with drawn out, narrow, often curved, rounded ends, initially 1-septate, rarely 2–3-septate, constricted at the central septum, slightly swollen above the central septum, walls rough, with small, pad-like, mucilaginous appendages at both ends. Asexual morph: Undetermined. (Description from Phookamsak et al. 2015)
Material examined: BRUNEI, Temburong, Batu Apio Forest Reserve, Sungai Belalong, Kualak. Field Studies Centre, Sungai Esu, on dead submerged bamboo, 1 February 1994, K.D. Hyde, (IFRD 8704, holotype).
Notes: Pseudoastrosphaeriella papillata was described by Hyde and Fröhlich (1998) from dead, submerged bamboo from a small stream in Brunei. Pseudoastrosphaeriella papillata may be a common species on submerged bamboo and wood in tropical regions (Luo et al. 2004; Pinruan et al. 2007) with 19.5 % percentage occurrence on submerged bamboo in the Liput River in Philippines (Cai et al. 2003). The collections, however, need verifying against the reference specimen of P. papillata. In this study, the type specimen of Astrosphaeriella papillata is examined and found that A. papillata has morphological characters related to Pseudoastrosphaeriella. Thus, we transfer Astrosphaeriella papillata to Pseudoastrosphaeriella. Pseudoastrosphaeriella papillata is similar to P. longicolla and the differences are discussed under that species. (Notes from Phookamsak et al. 2015)
Freshwater distribution: Brunei (Hyde and Frohlich 1998), Philippines (Cai et al. 2003), Yunnan, China (Luo et al. 2004)