Quadricrura
Quadricrura Kaz. Tanaka, K. Hiray. & Sat. Hatak., in Tanaka et al., Stud. Mycol. 64: 196 (2009).
Index Fungorum number: IF 515258; Facesoffungi number: FoF 06670, 3 morphological species (Species Fungorum 2022), 3 species with molecular data.
Saprobic on host. Sexual morph: Unknown. Asexual morph: Mycelium superficial. Conidiophores absent. Conidiogenous cells monoblastic, indistinguishable from creeping hyphae. Conidia globose to subglobose, with thin peel on the outer wall of conidia, composed of numerous internal hyphae at the inside, solitary, brown to dark brown, verrucose at the base, with setose appendages. Appendages of two forms, unbranched, smooth, brown at the base and almost hyaline at the apex: long appendages usually single or 2, arising from apical part of conidia; short appendages mostly 4 to 5, arising from basal side part of conidia (adapted from Tanaka et al. 2009).
Type species: Quadricrura septentrionalis Kaz. Tanaka, K. Hiray. & Sat. Hatak.
Notes: Quadricrura is characterised by superficial mycelium, globose to subglobose conidia with smooth appendages that are brown at the base and nearly hyaline at the apex. Quadricrura resembles Piricaudilium in having internal hyphae in the conidia and in having peel-like outer wall of conidia (Chen & Tzean 1993, Tanaka et al. 2009). Quadricrura differs from Piricaudilium in conidial characters, especially presence of setose appendages, one or two long appendages arising from the apical part and typically four to five short appendages around the basal sides (Tanaka et al. 2009). Quadricrura differs from Pseudopetrakia in that Pseudopetrakia produces setose appendages only on the apex of muriform conidia (Ellis 1976). Quadricrura is morphologically and phylogenetically a distinct genus in Tetraplosphaeriaceae. Molecular markers available for Quadricrura are ITS, LSU, SSU, BTUB and TEF-1.
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