Kriegeriales » Camptobasidiaceae » Camptobasidium

Camptobasidium hydrophilum

Camptobasidium hydrophilum Marvanová & Suberkr. 1990 in Marvanová & Suberkropp, Mycologia, 82(2), 208-217 (1990)

Etymology:  Hydrophilos (Gr.) = loving water.

Diagnosis: Colonies (2% MA) growing slowly at 12-23 oC, pale rosy, glabrous; aerial mycelium scanty, delicate, downy, sometimes funiculosc, or absent; laccase and tyrosinase tests negative. Hyphae 1-4 µm wide; cells binucleate; septa without dolipores clamps relatively large, secondary septa abundant in older parts of the colony. Mycelial branches either long, often originating below a clamp of the parent hypha and bearing themselves a clamp ncar the base, rarely growing from a clamp on the parent element, or short, at the apical part of other hyphae, not separated from them by septa. Chlamydospores (Figure 1 I-L; 2K-M) produced under water, single and apical or lateral, or in groups, the first formed terminating the supporting hypha which finally becomes empty, subsequent chlamydospores growing sequentially from the clamp present at the base of each chlamydospore (Figure 1J, K); shape variable, typically broadly fusiform or elliptical, 11-26 x 7-10 µm, but also irregular, sometimes resembling the conidiogenous cell as if having been transformed from it; walls slightly thickened, hyaline, later pale brown, cytoplasmic content pearly, finely granulous, staining intensively with lactofuchsin. Sporogenous structures produced under water, usually somewhat later than chlamydospores. Probasidia integrated with fertile hyphae, terminal. Metabasidia (Figure lA-H; 2A-J, stippled) mostly recurved, 1-3 septate, 19-31(-46) x 3-5.5 µm; base without clamp; spent segments often devoid of cytoplasm; sporogenous loci mostly on the convex side of the meta basidium just below the septa and at the apex. Basidiospores in groups of up to 20, rarely single, sessile on inconspicuous denticles, typically drop-shaped with a truncate base situated somewhat obliquely, 2.5-4.0 x 1-2 µm, sometimes becoming elongated or even somewhat filamentous and branched (Figure 1A, E, G; 2A, B). Liberated basidiospores were not seen germinating.

Index Fungorum Number: IF127395

 

Figure 1. Camptobasidium hydrophilum AL-17, from submerged culture. A, B, F. Typical mature basidia with sessile basidiospores. C. Young basidium; note the characteristic curvature of the basidium body. D, E. Two-celled basidia with basidiospores. A, E, G. Basidia with elongated basidiospores. H. Atypical straight basidium. I-L. Chlamydospores, single and in groups; note their acropetal development at the end of supporting hypha. Structures with cytoplasm are stippled. Bar = 20 µm.