Phylum:Basidiomycota >> Class: Basidiomycetes >>  Order: Tremellales 
 BCRC Number NO BCRC Number!  
 Scientific Name: Tremella occultifuroidea

Tremella occultifuroidea C.-J. Chen & Oberwinkler, Mycoscience 40:137-143. 1999.

 Description: Basidiocarp lacking, growing intrahymenia and inner part of dacrymycetaceous fungi. Basidia subglobose, (9-)11-12(-14) x (11-)13-15(-17) μm [Q*=0.71-0.93], broader than long, longitudinally septate, 2-celled, occasionally only one cell producing a sterigma; sterigmata 3-4.5 μm in diam., apically swollen up to 7 μm in diam., up to 230 μm long. Spores subglobose to broadly ellipsoid, rarely globose, (10-)11-13 x 9-11.5 μm [Q=(1.0-)1.10-1.16(-1.25)], with prominent apiculi, thin-walled, smooth, hyaline, non-amyloid, germinating by budding. Conidiogenous cells 6-8(-10) x 2.5-4(-5.5) μm [Q=(1.35-)1.71-2.29(-2.86)], basally swollen and apically tapering, occasionally the same diameter as hyphae, terminally and repeatedly bearing conidia, each conidium subtended by a clamp; conidiophores and basidia developing from the same generative hyphae. Conidia subglobose to ellipsoid, (4-)5-7(-8) x 3.5-4.5(-5.5) μm [Q=1.00-1.75(-2.0)], slightly to conspicuously thick-walled, gelatinous. Hyphae 2.0-2.5 μm in diam., occasionally swollen up to 3.5 μm in diam., clamped, hyaline, thin- to slightly thick-walled, gelatinous. Haustoria tremelloid, 2-2.5 μm in diam., frequently originating from clamps, especially from clamps of conidiogenous cells and basidia, haustorial filament apically swollen, attaching to host cell walls through micropores. Dolipores with cupulate parenthesomes. Host fruit-bodies of Dacrymyces sp. ca. 1.0 - 3.0 cm, rose-white to orange-white.

Collection sites: Taiwan, Kuanwu Forest, between Hsinchu county and Miaoli county, ca. 2000 m, on the way to waterfall, leg. C.-J. Chen, CCJ 1100; Taiwan, Tashue Shan Forest, Taichung county, ca. 2200m, on the mountain pass around guest houses, leg. C.-J. Chen, CCJ 1208. Habitat in basidiocarp of Dacrymyces sp. growing on decayed wood.

 Habitat: null



Bandoni, RJ. 1987; Chen, CJ. 1998; Oberwinkler, F and Bandoni RJ. 1981; Oberwinkler, F. 1990.


C. J. Chen

 Note: Three mycoparasitic Tremella species of dacrymycetaceous fungi have been described so far: T. obscura on Dacrymyces deliquescens (Bull.) Duby (= D. stillatus) and on D. minor Peck. (Olive, 1946a & 1946b), T. penetrans on D. stillatus (Hauerslev, 1979; Jülich, 1983), as well as T. giraffa on D. stillatus (Chen, 1998) . Tremella giraffa has pseudoclamps which are not observed in other Tremella species (Chen, 1998). Christiansen (1954) emended T. obscura which is supposedly based upon T. mycophaga var. obscura (Olive, 1946a). However, Oberwinkler (1990) restudied Christiansen's material and has shown that the description was based upon parts of two different taxa, viz. one with tremelloid basidia and another with the Occultifur internus conidiogenous cells. The type material of T. mycophaga var. obscura was restudied by Bandoni (1987). From reports in the literature (Olive, 1946a; Bandoni, 1987; Christiansen, 1954), Tremella obscura differs from T. occultifuroidea by the conidial apparatus, measurements of conidia and conidial nuclei. We checked 14 collections of Hauerslev which are labeled Sebacina penetrans Hauerslev (Hauerslev, 1979) (=T. penetrans), two of them representing a mixture with O. internus, while dikaryotic conidia and basidia of T. occultifuroidea develop from the same generative hyphae showing homogenous structures. The conidiogenous cells are swollen and tapered above, terminally and repeatedly bearing conidia, each conidium subtended by a clamp. Such conidiophores were discovered by Olive (1954) in Platygloea peniophorae Bourd. & Galz. var. interna Olive. Oberwinkler (1990) used these characteristics to propose Occultifur internus (Olive) Oberwinkler. Tremella occultifuroidea has similar conidiophores and conidiogenous cells, but differs in tremelloid basidia. The terminally and repeatedly conidiogenous cells had also been shown in the Tremella polyporina Reid (1970) sensu Koske growing in the hymenium of Tyromyces lacteus (Koske, 1972). However, it is not clear that basidia and conidiogenous cells of Koske's material are homogenous or heterogenous. In addition, the measurements of the basidia, basidiospores, conidiogenous cells and conidia of the species differ from that of T. occultifuroidea. Oberwinkler and Bandoni (1981) published Tetragoniomyces uliginosus (Karst.) Oberw. & Band. showing similar conidiogenous structure of basidiophore but bearing thick-walled, terminal, and repeated basidia. Therefore, Tremella occultifuroidea is a new taxon separated from all known Tremella parasites of dacrymycetaceous fungi.