Caryospora submersa W. Dong, H. Zhang & K.D. Hyde
Index Fungorum number: IF557905; Facesoffungi number: FoF09248
Etymology: in reference to submerged habitat of the fungus
Holotype: MFLU 18–1539
Saprobic on decaying wood submerged in freshwater. Sexual morph: Ascomata 400–450 μm high, 450–540 μm diam., black, scattered or gregarious, superficial, conical, flattened at the base, carbonaceous, with ostiolate papilla. Peridium 45–85 μm at the sides, poorly developed at the base, easily cracked, strongly carbonized, composed of several black, amorphous layers of cells that cannot be differentiated and often occluded. Pseudoparaphyses 2 μm diam., numerous, trabeculate, filiform, hyaline, sparsely septate. Asci 130–180 × 17–26 μm (x̄ = 160 × 21 μm, n = 20), 8-spored, bitunicate, narrowly obclavate, with rounded apex, short pedicellate, with a well-developed ocular cham- ber. Ascospores 38–50 × 8–12 μm (x̄ = 44 × 9 μm, n = 20), mostly uniseriate near the apex, becoming biseriate towards the base, straight or slightly curved, hyaline, 1-septate, constricted at the septum, narrowly fusiform, guttulate, thin-walled, smooth, surrounded by a large, oblong or ellip- soidal, mucilaginous sheath, 40–80 μm wide, sheath becoming thin and dumbbell-like in dried specimen, 1.5–2.5 μm wide at the sides and 5–15 μm wide at two ends. Asexual morph: Undetermined. (Description from Dong et al. 2020)
Culture characteristics: On PDA, colony circular or ellipsoidal, reaching 10 mm diam. in 10 days at 25 °C, grey to black from above, dark brown from below, surface rough, dry, raised, edge entire.
Material examined: THAILAND, Songkhla Province, Chestnut hill, on submerged wood in a stream, 10 May 2018, W. Dong, hat458-1 (MFLU 18-1539, holotype), ex-type living culture MFLUCC 18-1283; ibid., hat458-2 (HKAS 105039, isotype), ex-type living culture KUMCC 19-0056; Satun Province, on submerged wood in a stream, 10 May 2018, W. Dong, hat286-1 (MFLU 18-1541), living culture MFLUCC 18-1409; ibid., hat286-2 (HKAS 105070).
Notes: Caryospora submersa is similar to other Caryospora species in having superficial, dark, carbonaceous ascomata with flattened bases. Caryospora submersa is very different from other species by obclavate asci and narrowly fusiform, hyaline, thin-walled ascospores contrasting with broadly cylindrical to clavate asci and broadly fusiform, ellipsoidal or biconic, mostly pigmented, relatively thick- walled ascospores (Jeffers 1940; Hawksworth 1982; Abdel- Wahab and Jones 2000; Raja and Shearer 2008; Zhao and Zhao 2012; Ariyawansa et al. 2015). Caryospora submersa does not fit the generic concept of Caryospora except for the large, superficial, carbonaceous ascomata, which are simi- lar to those in other genera within the family. However, C. submersa cannot be placed in other genera due to its distinct morphology and phylogenetically nests in Caryospora with strong bootstrap support. (Notes from Dong et al. 2020)
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