Colletotrichum rhombiforme Damm, P.F. Cannon & Crous, Studies

Wang, Qiu-Tong, Liu, Xiao-Ting, Ma, Hai-Ying, Shen, Xiao-Ye & Hou, Cheng-Lin, 2019, Colletotrichum yulongense sp. nov. and C. rhombiforme isolated as endophytes from Vaccinium dunalianum var. urophyllum in China, Phytotaxa 394 (4), pp. 285-298 : 294

Colletotrichum rhombiforme Damm, P.F. Cannon & Crous, Studies in Mycology 73: 95. ( Fig. 5 )

MycoBank MB800511

Colonies on PDA at first white and becoming greyish white, reverse ivory-white to pale yellow; growth rate 1.7−2.1 mm ([= 1.9±0.2, n = 6) per day at 25 ˚C, attaining 1.2−1.5 cm in 7 days. Aerial mycelium dense, cottony, septate, smooth-walled, branched. Setae present, medium to dark brown, smooth-walled, septate, 70−90 μm long. Conidia not observed on PDA but produced on SNA. Sclerotia and acervuli absent.

Asexual morph on SNA. Colonies on SNA flat with entire margin, grey-white, agar medium partly covered with felty whitish aerial mycelium, reverse pale grey. Conidiogenous cells hyaline to pale brown, smooth, cylindrical, often lacking a basal septum and continuous with the conidiophore. Conidia hyaline, smooth-walled, fusiform to cylindrical, with obtuse to slightly rounded or actue ends, sometimes both ends rounded, 12−15 × 4−5 μm (mean 13.5±1.5 × 4.5±0.5, n = 30). Appressoria in slide culture formed from conidia and vegetative hyphae, pale brown, aseptate, smooth-walled, shape including ovoid or slightly irregular, edge entire, 11−14 × 5−7 μm (mean 12.5±1.5 × 6±1, n = 10). Sexual morph not produced in culture after 3 months.

Specimen examined:— CHINA. Yunnan Province: Yulong County, Lijiang, endophyte isolated from the leaves of V. dunalianum var. urophyllum , alt. ca. 2400 m, 20 July 2013, coll. C.L. Hou (BJTC 191, CFCC 50823).

Known distribution:— Yunnan Province, China; Mirandela, Portugal.

Figures

FIGURE 5. Colletotrichum rhombiforme (CFCC 50823) A, B. Upper and reverse sides of cultures on PDA 7 days after inoculation. C. Conidiogenous cells on SNA. D. Seta on PDA. E. Appressorium in slide culture. F. Conidia on SNA. Bars: C–F = 10 μm.