Hermatomycetaceae » Hermatomycetaceae » Hermatomyces

Hermatomyces bauhiniae

Hermatomyces bauhiniae Phukhams., D.J. Bhat & K.D. Hyde, in Hyde et al., Fungal Diversity: 10.1007/s13225-019-00429-2, [40] (2019)

Index Fungorum number: IF555500         Facesoffungi  number: FoF04827

 

Sexual morph: Undetermined. Asexual morph: Colonies on natural substrate forming sporodochial conidiomata, superficial, scattered, circular or oval, blackish brown, velvety, glistening, consisting of an orbicular, abundantly sporulation, conidia readily liberated when agitated, 160–180 µm wide. Mycelium mostly superficial, composed of a loose or compact network of repent, branched, septate, rough-walled, thick-walled, reddish brown to brown hyphae, 2–4 µm wide; subicular hyphae short, irregularly geniculate or flexuous, densely packed. Conidiophores 4–10 × 2–5 µm, micronematous or semimacronematous, mononematous, cylindrical, erect, smooth or finely verruculose, aseptate, unbranched, often corresponding to conidiogenous cells, hyaline. Conidiogenous cells 3–8 × 4–9 µm, holoblastic, monoblastic, integrated, terminal, determinate, cylindrical or slightly subulate, sub-sphaerical or ampulliform, hyaline. Conidia dimorphic, solitary, smooth-walled: lenticular conidia: 25–36 × 15–20 µm (x̅ = 30 × 18 µm, n = 70), muriform, smooth, broadly ellipsoidal to oval in front view, brown to dark brown, slightly constricted at the septa, in side view composed of one column of 4–6 cells, end cells subhyaline to pale brown, often carrying remnant of conidiogenous cell at base; cylindrical conidia: 20–28 × 8–11 µm (x̅ = 24 × 9 µm, n = 30), straight or flexuous, septate, constricted at the septa, consisting of one column, 2–3-septate, doliiform, cylindrical or subcylindrical, apical cells clavate or doliiform, verrucose, apex rounded, basal cells globose or subglobose, smooth, hyaline.

 

Culture characteristics: Colonies on MEA at room temperature (25 ) reaching 7 cm in 2 weeks, circular with entire margin, with white–grey mycelium, white at the margin, smooth at the surface and raised, mycelium strongly radiating into agar; reverse beige, no sporulation in cultures.

 

Habitat: Saprobicon on dried branch of Bauhinia variegata (Fabaceae)

 

Known distribution: Thailand

 

Material examined: THAILAND, Phrae Province, on dried branch of Bauhinia variegata (Fabaceae), 25 July 2015, C. Phukhamsakda, S1_02 (MFLU 18–1381, holotype), ex-type living culture (MFLUCC 16–0395, ICMP 21948).

 

GenBank numbers ITS: MK443382, LSU: MK443378, RPB2: MK443386, SSU: MK443380, TEF1-a: MK443384.

 

Notes: Hermatomyces bauhiniae is introduced as a new species based on its distinct morphology and support from phylogenetic analysis. Hermatomyces bauhiniae has distinct characteristics as compared to the other species. The lenticular conidia are not round or flat in one plane, and have well visible conidiogenous cells attached at the bottom of the conidia. In the phylogenetic analysis, H. bauhiniae formed a clade with H. indicus with good support (MLBS = 82; BYPP = 0.99). Both species were recorded from angiosperms plants. Nonetheless, H. bauhiniae can be  distinguished from H. indicus by having straight conidia with only one column, hyaline, and cylindrical conidia, where as in H. indicus conidia are turbinate, grey-brown at the apex, and become hyaline towards the base with two columns. Hermatomyces indicus has larger cylindrical conidia but smaller lenticular conidia (Prasher and Sushma 2014; Doilom et al. 2017).