Dothideomycetes » Dothideomycetes, genera incertae sedis » Chaetosticta

Chaetosticta perforata

Chaetosticta perforata (Ellis &Everh.) Petr. & Syd., Annls mycol. 23(3/6): 270 (1925)

Chaetomella perforata Ellis & Everh., J. Mycol. 1(12): 153 (1885)

= Pyrenochaeta erysiphoides Sacc., Annls mycol. 3(6): 512 (1906) [1905]

Index Fungorum number: IF163090; Facesoffungi number: FoF 06227                                            Fig. 1

Endophytic or pathogenic on lower surface of living leaves of Cirsium arvense (Asteraceae). Sexual morph: Undetermined. Asexual morph: Pycnidia 135–173 μm high × 104–143 μm diam (x̅ = 150.6 × 121.8 µm, n = 10), superficial, loosely scattered, roundish to subglobose, papillate, black, sparingly clothed with straight, translucent olive brown continuous, bristle-like hairs about equal in length to the diameter of the perithecia, more thickly set around the orifice, paler and more or less substellate-tufted below, easily removed from the host surface. Conidiophores branched, septate, compact, hyaline, cylindrical, tapered towards the apex, smooth. Conidiogenous cells 3–4 µm, 1.2–1.3 µm (x̅ = 3.8 × 1.3 µm, n = 10), enteroblastic, phialidic, with minute collarette, discrete or integrated, cylindrical, tapered towards the apex. Conidia 4.8–6.0 µm × 2.4–3.1 µm (x̅ = 5.4 × 2.4 µm, n = 10), numerous, dense, small, very variable from short oblong to oblong-elliptical, aseptate, hyaline, with one to many oil droplets, smooth-walled.

Material examined – ITALY, Veneto, Selva (Treviso), on leaves of the living Cirsium arvense (Asteraceae), August 1905, P. A. Saccardo (S-F49139, isotype).

Economic significance – The genus Chaetosticta has been reported to cause zonate leafspot of Cowpea (Lefebvre & Stevenson 1945). Chaetosticta cf. perforata also functions as mycorrhizae in some plants such as the orchids, especially Trichosalpinx orbicularis and Trigonidium egertonianum (Bayman & Otero 2006).