Kathistes Malloch & M. Blackw., Can. J. Bot. 68(8): 1712 (1990)
Diaporthomycetidae, Ophiostomatales, Kathistaceae, Kathistes
Saprobic on herbivore dung. Sexual morph: Ascomata hyaline to pale brown, subsphaerical to spherical, transparent, glabrous, thin-walled, with a long neck, with hyphal attachments extending into the substrate. Ostiolar dark reddish brown, neck long, composed of parallel hyphal elements, ended by incurved setae to form a cuplike apex, a lot with a condensed collar-like area joined to the perithecium. Peridium one cell layer thick, containing cells of textura angularis in surface view. Hamathecium lacking. Asci 8-spored, unitunicate, ellipsoidal to roughly clavate, short pedicellate, elongated below, thin-walled, evanescent at maturity, arranged in a basal fascicle. Ascospores hyaline, barely clavate to falcate, smooth, initially unicellular, one septum initially and more septa at maturity, without pores or slits, lacking gelatinous sheath, germinating by recurrence of budding yeast-like cells. Asexual morph: Conidiomata hyaline, superficially related to the ascomata, spherical, with a long neck, without hyphal attachments. Peridium containing flattened cells of textura angularis, one cell layer thick. Ostiolar neck dark reddish brown, unicellular, rising from a single peridium cell, endless into the hollow center of the conidiomata, open apically at development. Conidia hyaline, spherical, produced in the center of the conidiomata, smooth, escaping in a continuous chain through the ostiolar neck (adapted from Maharachchikumbura et al. 2016).
Type species: Kathistes calyculata Malloch & M. Blackw., Can. J. Bot. 68(8): 1712 (1990)
Notes: Kathistes was introduced as the type genus in Kathistaceae by Malloch & Blackwell (1990), which was originally described with three species (K. analemmoides, K. calyculata, K. fimbriata). The genus is characterized by long-necked, brown to dark ascomata, transparent at the base, and germinating ascospores produced by budding yeast-like cells (Malloch & Blackwell 1990).
Species illustrated in this entry:
Kathistes calyculata Malloch & M. Blackw
Maharachchikumbura SSN, Hyde KD, Jones EBG, McKenzie EHC et al. 2016 – Families of Sordariomycetes. Fungal Diversity 79, 1–317
Malloch D, Blackwell M. 1990 – Kathistes, a new genus of pleomorphic ascomycetes. Canadian Journal of Botany 68, 1712–1721