Dothideomycetes » Dothideomycetes, genera incertae sedis


Arkoola J. Walker & Stovold, Trans. Br. mycol. Soc. 87(1): 28 (1986).

Index Fungorum number: IF 25745; Facesoffungi number: FoF 12129, 1 morphological species (Species Fungorum 2022), no molecular data available.

Saprobic and parasitic on host. Sexual morph: Pseudothecia mainly superficial, sometimes erumpent, developed from mycelium on dead fallen organs of infected plants, large, black, setose, subglobose to broadly ovoid to obpyriform, uniloculate, ostiolate. Pseudothecial wall composed of several layers of oval to oblong cells forming a textura angularis. Asci cylindrical, shortly stipitate, 8-spored, bitunicate with fissitunicate dehiscence, with an ocular chamber. Ascospores large,uniseptate, ellipsoidal to fusiform, pale greenish, surrounded by a thin gelatinous sheath. Pseudoparaphyses abundant, hyaline, filiform, branched, cellular. Asexual morph: Unknown (adapted from Walker and Stovold 1986).

 Type species: Arkoola nigra J. Walker & Stovold

Notes: Arkoola is characterised by superficial, sometimes erumpent pseudothecia, cylindrical, shortly stipitate, 8-spored asci, and large,uniseptate, ellipsoidal to fusiform, pale greenish ascospores surrounded by a thin gelatinous sheath. Arkoola resembles Protoventuria and Macroventuria but differs from Protoventuria in lacking a well-developed hypostroma and in size and from Macroventuria in centrum morphology, copious superficial mycelium, size and parasitic habit. Molecular data is lacking for Arkoola. The generic placement of Arkoola is doubtful and is currently in Dothideomycetes genera incertae sedis. Fresh collections with DNA sequence data are needed to confirm the generic placement of Arkoola.


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