Periconia minutissima Corda
Index Fungorum number: IF241286; Facesoffungi number: FoF 02943
Reference specimen: HKAS 92801
Saprobic on submerged decaying wood. Sexual morph Undetermined. Asexual morph Colonies on the substratum superficial, numerous, effuse, dark brown to black, floccose. Mycelium partly superficial, composed of septate, hyaline hyphae. Conidiophores macronematous, mononematous, unbranched, erect, straight or slightly flexuous, single, septate, brown, 117–143 μm (x̅ = 130 μm, SD = 13 μm, n = 10) long, 7.5–9.5 μm (x̅ = 8.5 μm, SD = 1 μm, n = 10) wide, the apex forming sphaerical heads. Conidiogenous cells monoblastic, terminal, pale brown, discrete on stipe and branches. Conidia catenate, globose, pale brown to dark brown, verruculose, 4.5–5.5 μm (x̅ = 5 μm, SD = 0.5 μm, n = 20) diameter. (Descriptions from Hyde et al. 2017)
Material examined: CHINA, Yunnan Province, Dali, saprobic on submerged decaying wood in Lake Erhai, 3 May 2014, X.J. Su, EH 3–1 (HKAS 92801, reference specimen designated here), living culture, MFLUCC 15-0245.
Notes: Periconia minutissima was introduced by Corda (1837) and is characterized by conidiophores with concolorous branches, sphaerical conidia, verruculose or with short spines, long branches, often widely spaced, irregular, mostly 4–6 lm diameter (Ellis 1971). A fresh isolate was obtained from submerged wood in Lake Erhai during our study of lignicolous freshwater fungi in Yunnan Province. The morphological characteristics of our fresh collection especially the shape and diameter of conidia fit perfectly with the description of P. minutissima. Thus, we identified our fresh isolate as P. minutissima, provide sequence data for this species and this is the first record for China. Ariyawansa et al. (2014) suggested that if the some morphological characteristics of the fungus being studied differ from those in the original description, original material exists but cannot be examined, or its location is different, or the host differs from the holotype, or if no sequence data can be obtained from an otherwise satisfactory existing type material, we can designated a reference specimen (RefSpec) in order to clarify the placement of the species using morphology coupled with molecular data. The morphological characteristics of our new collection fit well with the holotype of Periconia minutissima Corda (1837), however we could not obtain material from the same host or location and therefore a reference specimen is designated here. (Notes from Hyde et al. 2017)