Dothideomycetes » Dothideomycetes, genera incertae sedis » Alascospora

Alascospora evergladensis

Alascospora evergladensis Raja, Violi & Shearer, Mycologia 102(1): 36 (2010)                                                                Fig. 27

 

Index Fungorum number: IF 514032; Facesoffungi number: FoF 06209

 

Saprobic on petiole of Nymphaea odorata. Sexual morph: Ascomata 125–232 high × 135–236 µm diam., superficial to partly immersed, scattered, globose, subglobose or hemispherical and flattened at the base, membranaceous, ostiolate, light brown, translucent when young, darkening with age. Peridium 5–10 µm wide, composed of hyaline to brown pseudoparenchymatic cells, with dark brown amorphous material deposited irregularly on the peridial surface, especially dense around the ostiole. Pseudoparaphyses not observed. Asci 38–59 µm × 38–63 µm ( = 54.5 × 63 µm, n = 10), bitunicate, fissitunicate, multiguttulate, thick-walled, globose to subglobose, short, pedicellate, containing eight irregularly arranged ascospores, without an ocular chamber, rounded at the apex. Ascospores 30–35 µm × 12–16 µm ( = 33 × 14.5 µm, n = 10), ellipsoidal, 1-septate, with thin septum, hyaline when immature, becoming dark brown when mature, upper cell longer and wider than lower cell, with apical papillae and appressed sheath outlining the ascospores. Asexual morph: Undetermined.

 

Material examinedUSA, Florida, Everglades Water Management District, Water Conservation Area 2A, phosphorus unenriched site U3, 26o17’15.070”N, 80o 24’41.08”W, water temperature 19 oC, pH 7, on submerged petiole of Nymphaea odorata (Nymphaeaceae), 17 November 2008, Huzefa A. Raja and Helen Violi. (ILL40789, micro slide of holotype).

 

Economic significance Alascospora evergladensis is a saprobe and plays a role in breakdown and mineralization of organic matter in freshwater habitats (Jones et al. 2000).