Phacidium foliicola (Lib.) W.J. Li & K.D. Hyde
≡ Cytospora foliicola Lib., Pl. crypt. Arduenna, fasc. (Liège) 1(nos 1-100): no. 64 (1830)
= Ceuthospora foliicola (Lib.) Cooke, Grevillea 8(no. 46): 60 (1879)
Saprobic on plants, such as Berberis microphylla (Berberidaceae), B. vulgaris, Calocedrus decurrens (Cupressaceae), Cornus mas (Cornaceae), Genista sagittalis (Fabaceae), Hedera helix (Araliaceae), Photinia serrulata (Rosaceae), Vinca minor (Apocynaceae) (Nag Raj 1993, this study). Sexual morph: undetermined. Asexual morph: Conidiomata 300–360 µm diam., 140–180 µm high, black, solitary to gregarious or confluent, pycnidial, initially deeply immersed in the host mesophyll, then becoming partly erumpent and raising the host epidermis into subconical swellings, multilocular, with locules 50–130 µm diam., 100–170 µm high?, globose to subglobose, glabrous, thick-walled, ostiolate. Ostioles circular, centrally located. Conidiomatal wall 15–40 µm wide, composed of pale brown, thick-walled cells of textura globulosa in the outer layer, become hyaline cells of textura angularis in the inner layer. Conidiophores arising around the cavity of the locules, hyaline, cylindrical to subcylindical, straight or curved, septate, branched, smooth-walled. Conidiogenous cells 26–28 × 1–3 µm, hyaline, enteroblastic, phialidic, cylindrical to subcylindrical, usually integrated, smooth-walled, with periclinal thickenings. Conidia 10–14 × 2–2.5 ( = 12 × 2.5 µm), hyaline, subcylindrical, rounded at both ends, with a minute dehiscence scar, straight or slightly curved, smooth, bearing a funnel-shaped or irregular, mucoid, apical appendage.
Material examined: Germany, Königstein, on leaves of Vinca minor (Apocynaceae), October 1885, W. Krieger, (FH).
Notes: The description of the conidia is adapted from Nag Raj (1993).
Phacidium foliicola (FH). a, b Herbarium package and specimen. c, d Appearance of brown to dark brown conidiomata on the host. e Vertical section of conidiomata. f–g, i Section of peridium. h Ostiole. j–m Conidiophores and conidiogenous cells. Scale bars c–d = 200 µm, e = 100 µm, f, h = 50 µm, g, i = 20 µm, j–m = 20 µm.
Li WJ, McKenZie EHC, Liu JK, Bhat DJ, Dai DQ, Caporesi E, Tian Q, Maharachcikumbura SSN, Luo ZL, Shang QJ, Zhang JF, Tangthirasunun N, Karunarathna SC, Xu JC, Hyde KD (2020) Taxonomy and phylogeny of hyaline-spored coelomycetes. Fungal Diversity 100: pages279–801.