Hadrospora
Hadrospora Boise
Index Fungorum number: IF 25305
Saprobic on woody or monocotyledonous hosts in terrestrial or submerged wood in freshwater habitats. Sexual morph: Ascomata solitary to scattered, immersed to semi-immersed, erumpent, with black dots on the host surface, uniloculate, globose to subglobose, dark brown to black, glabrous, ostiolate, with a minute papilla. Peridium thin-walled, composed of black, broad pseudoparenchymatous cells, arranged in a textura angularis. Pseudoparaphyses numerous, trabeculate, filamentous, distinctly septate, frequently anastomosing. Asci 8-spored, bitunicate, fissitunicate, ovoid to ampulliform, sessile to minutely pedicellate, apically rounded, with indistinct ocular chamber. Ascospores uni- to tri-seriate, broadly fusiform, vermiform, brown to reddish-brown, paler at the end cells, phragmosporous, with or without sheath (Tanaka and Harada 2003; Phookamsak et al. 2014). Asexual morph: zalerion-like. Hyphomycetous. Conidia holoblastic, helicoid, multiseptate, constricted at septa, brown to dark brown, smooth (Tanaka and Harada 2003). (Description from Dong et al. 2020)
Type species: Hadrospora fallax (Mouton) Boise
Notes: Hadrospora was introduced to accommodate two species H. clarkia (Sivan.) Boise and H. fallax, which were transferred from Trematosphaetria (Boise 1989). The familial placement of Hadrospora is ambiguous due to the dearth of sequences. Hadrospora was accepted in Phaeosphaeriaceae (Hyde et al. 2013), but later suggested in Trematosphaeriaceae based on morphology (Phookamsak et al. 2014). Hadrospora has ovoid to ampulliform asci and hyphomycetous asexual morph (Tanaka and Harada 2003; Phookamsak et al. 2014). Phaeosphaeriaceae members mostly have cylindrical to cylindri-clavate asci and coelomycetous asexual morphs (Hyde et al. 2013). We place Hadrospora in Trematosphaeriaceae following Phookamsak et al. (2014) and Wijayawardene et al. (2018, 2020), until sequence data of H. fallax are obtained to confirm its familial placement.
The ascospore size of Hadrospora fallax in the holotype (BR5 020009617141) are 55–80 × 16–22 µm (Zhang et al. 2012; Phookamsak et al. 2014). Tanaka and Harada (2003) described the ascospores as larger, 63.5–104.5 × 17.5–29 µm, with a conspicuous sharply delimited sheath which was not mentioned in the holotype. Hadrospora fallax produced a zalerion-like asexual morph in PDA culture (Tanaka and Harada 2003). (Description from Dong et al. 2020)
List of freshwater Hadrospora species
Hadrospora fallax (Mouton) Boise, Mem. N. Y. bot. Gdn 49: 310 (1989)
Basionym: Trematosphaeria fallax Mouton, Bull. Soc. R. Bot. Belg. 25(no. 1): 155 (1886)
Freshwater distribution: China (Luo et al. 2004)
References
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