Pleosporales » Trematosphaeriaceae

Hadrospora

Hadrospora Boise, Mem. N. Y. bot. Gdn 49: 310 (1989).

 Index Fungorum number: IF 25305; Facesoffungi number: FoF 00285, 1 morphological species (Species Fungorum 2022), No molecular data available.

Saprobic on woody or monocotyledonous hosts. Sexual morph: Ascomata scattered, solitary, immersed to semi-immersed, or erumpent through host tissue, visible as tiny, small, black dots on the host surface, uniloculate, globose to sub globose, glabrous, dark brown to black, ostiole central with a minute papilla. Peridium thin-walled, composed of black, broad pseudoparenchymatous cells, arranged in a textura angularis. Hamathecium composed of numerous, filamentous, distinctly septate, frequently anastomosing, narrow cellular pseudo paraphyses. Asci 8-spored, bitunicate, fissitunicate, ovoid to ampulliform, sessile to minutely pedicellate, apically rounded, with indistinct ocular chamber. Ascospores overlapping 1–3-seriate, phragmosporous, broadly fusiform, vermiform, brown to reddish-brown, paler at the end cells, septate, smooth-walled. Asexual morph: Unknown (adapted from Phookamsak et al. 2014).

Type species: Hadrospora fallax (Mouton) Boise

Notes: Hadrospora was tentatively placed in Phaeosphaeriaceae based on morphology such as its small ascomata, thin-walled peridium and narrow pseudoparaphyses (Boise 1989, Zhang et al. 2012). Hadrospora is unique in having large vermiform ascospores, ampulliform to saccate asci and trabeculate pseudoparaphyses (Shearer 1993, Boise 1989, Tanaka & Harada 2003, Zhang et al. 2012). Hadrospora resembles Mixtura in having large ascospores, and saccate asci but Hadrospora is saprobic on several hosts, while Mixtura was described as a plant pathogen of bamboo. The asexual morph of Hadrospora was described as zalerion-like which is characterised by holoblastic, helicoid, multiseptate, brown to dark brown, smooth-walled conidia which are constricted at the septum (Tanaka & Harada 2003). Zhang et al. (2012) proposed to exclude Hadrospora from Phaeosphaeriaceae and this was followed by Phookamsak et al. (2014). Currently, Hadrospora is tentatively placed in Trematosphaeriaceae but this placement must be confirmed by molecular data.

 

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