Tremellales » Trimorphomycetaceae » Trimorphomyces

Trimorphomyces papilionaceus

Trimorphomyces papilionaceus Bandoni & Oberw. 1983, in Oberwinkler & Bandoni, Systematic and Applied Microbiology, 4(1), 105-113. (1983).

Diagnosis: Fructifications pulvinate (Figure 8), hyaline to slightly milky or sometimes faintly greenish, almost transparent, gelatinous, mostly less than 1 mm wide, sometimes anastomosing and exceeding 2 mm, drying to thin, faintly brownish, horny spots. Hyphae of sporocarp short, compactly arranged, radiating (Figure 9), hyaline, with clamps, mostly 2.5-3 µm in diam., sometimes swollen to 4µm, with haustoria, giving rise to conidiogenous cells and/or basidia terminally, proliferating laterally. Conidiogenous cells (Figures 6, 7) 6-15-(20) x 2.5-4 µm, the shortest ones often bottle-shaped and phialide-like, longer cells more or less cylindric; conidia developing blastogenously, from two closely-situated, apical loci (Figures 6, 7, 17-19, 23, 24), the loci at first inconspicuous, elongating with successive conidial formation, the conidiogenous eelI apex eventually becoming bifurcate; conidia at first narrowly elliptic to cylindric, conjugating before maturity (Figures 6, 7, 16-18,23), papilionoid in face view when released (Fig. 20), 3.5-7 x 3.5-5.5 µm. Conidia germinating (Figure 10) by formation of synchronous, paired buds, the paired budding loci commonly subpolarly on one of the two conjugated parental cells, a dikaryotic yeast phase developing in culture; budding dikaryotic cells at first l-l-shaped, enlarging, the isthmus finally visible only as a slight constriction or becoming obliterated (Figures 22, 24, 25); budding loci becoming prominent with repeated budding, a short tubular process slowly forming between the parent cell and the loci; secondary budding sites often initiated on parental cells, these developing at the wall itself or apically on a clamped, short tubular process, the latter with the potential to develop into a short dikaryotic hypha, a haustorium (Figures 21, 22, 24), or a conidiogenous cell (Figures 21, 23-25); infrequently, 2 pairs of budding loci occur side-by-side. Probasidia (Figures 1, 2, 11) at first narrow to broadly clavate, becoming capitate or pyriform, usually tapering to a long basal stalk; mature basidia (Figures 2-4) diagonally to irregularly cruciate-septate at maturity, (9)-12-18-(22) x 7-9.5-(11) µm; epibasidia narrow, cylindric, to 120 x 1.5-2.5 µm, slightly swollen apically. Basidiospores subglobose to broadly oval, 6-8 x 5-7 µm, the apiculus oblique or sometimes situated at right angles to the long axis; germination by repetition or by budding, in the latter case, budding directly or from apices of one to several elongate cells which remain attached to the basidiospore, yeast cells oval to fusiform or cylindric, 5-8-12 X 3-4.5 µm

Index Fungorum Number: IF106523



Figure 1-9. Trimorphomyces papilionaceus. 1-5. Fertile hyphae with basidia; developing basidiospores, and mature basidiospores (2, top); note empty conidiogenous cells in Figures 1 and 5, and aberrant basidia in Figure 3. - Figures 6, 7. Conidiogenous cells, conidia, and production of synchronous, conjugating buds (Figure 6, top). Figure 8. Habit sketch of basidiocarp and associated Arthrinium conidia.


Figure 10. Dikaryotic yeast phase of Trimorphomyces papilionaceus. Diagrammatic representation of budding of dikaryotic conidium. Young cell (arrow) enlarges, budding repeatedly. Old cells may die (below); some cells produce short, clamp ed tubular extensions (top) which may either develop new apical budding loci or, presumably, can continue hyphal growth.