Xanthoriicola D.Hawksw.
Type : * Xanthoriicola physciae (Kalchbr.) D.Hawksw. [= * Gymnosporium physciae Kalchbr.]
Description : Lichenicolous. Stromata, setae and hyphopodia absent. Conidiophores semi-macronematous, densely aggregated, mononematous, erect, branched, irregularly penicillate, short, smooth, brown. Conidiogenous cells monophialidic, terminal, determinate, oblong to ampulliform, with a short apical colarette, brown. Conidia produced singly, dry, globose, simple, with minutely echinate walls, olivaceous-brown to brown.
Xanthoriicola is a monospecific genus included in the Anamorphic Ascomycota (Kirk et al. 2001; Lawrey & Diederich 2003; Eriksson et al. 2004; Pennycook & Galloway 2004; Eriksson 2005) and parasitises apothecia of its host, the lichen Xanthoria parietina (Hawksworth & Punithalingam 1973; Hawksworth 1979a; 1983a; Preece & Blackwell 2004). Diederich (1989: 256) suggests also Xanthoria polycarpa as a possible host.
