Marquandomyces Samson, Houbraken & Luangsa-ard, gen. nov.

Index Fungorum number: MB 834879; Facesoffungi number: FoF14490

Etymology: Named after an estate in Guernsey (UK).

Type species: Verticillium marquandii Massee, Trans. Br. Mycol. Soc.1: 24. 1898.

Description (based on Samson, 1974): Macromorphology: Col- onies on malt-agar growing moderately fast, attaining a diameter of 5– 7 cm within 2 wk at 25 °C, consisting of a dense felt with a floccose overgrowth of aerial mycelium, in fresh isolates sometimes producing short erect loose synnemata; at first white, becoming pale vinaceous to vinaceous near dark vinaceous brown, changing with age to brown shades. Colony reverse usually bright yellow to orange-yellow, exudate usually diffusing into the surrounding agar, with age becoming yellow-brown.

Micromorphology: Vegetative hyphae hyaline, smooth-walled, 2.5–3.2 μm wide. Conidial structures variable, mostly verticillate, sometimes loosely synnematous, especially in fresh isolates. Co- nidiophores hyaline, smooth-walled, 50–300 × 2.5–3 μm, arising from submerged hyphae or formed as side branches on the aerial hyphae, consisting of verticillate branches with whorls of 2–4 phialides. Phialides 8–15 × 1.5–2 μm, consisting of a short cylin- drical to ellipsoidal basal portion, tapering into a distinct neck, about 1 μm wide. Conidia in dry divergent chains, ellipsoidal to fusiform, smooth-walled to finely roughened, hyaline, pale vinaceous en masse, 3–3.5 × 2–2.2 μm. Chlamydospore-like structures usually present in the submerged mycelium, consisting of solitary, thin- walled, globose to ellipsoidal cells, about 3.5 μm in diameter.


  • Verticillium marquandii