Phylum:Basidiomycota >> Class: Basidiomycetes >>  Order: Polyporales 
 BCRC Number NO BCRC Number!  
 Scientific Name: Amauromyces farinaceus

Amauromyces farinaceus 1993. Boidin et al., Bull. Soc. Mycol. France. 109: 93-100. 1993.

 Description: Basidiocarps of A. farinaceus are corticioid, whitish to hyaline, 40–80 µm thick, and grow on decayed wood. The hyphal system is monomitic and consists of hyaline, fibulate, 2–4 µm thick hyphae that are irregularly thickened. The walls consist of a spongy to fibrous matrix. Hyphae adnate to the substrate are long-celled and loosely interwoven. Those of the subhymenium are short-celled and densely packed. The cytoplasm of hyphal cells apparently contains oily components, according to observations with the light microscope. As seen by transmission electron microscopy, hyphae have septa with dolipores with perforate parenthesomes and spongy cell-wall thickening. There are no cystidia, gloeocystidia or hyphidia. Basidia produce four sterigmate, are predominantly short-ellipsoidal, 7–15(–20) × 4–5 µm, and mostly arranged in basidial clusters developing by lateral outgrowths of clamps. One conspicuous feature is cell-wall swelling in the lower parts of the basidia. As seen by transmission electron microscopy, wall-thickening develops in young basidial stages and continues to enlarge asymmetrically inward, finally leaving a cytoplasmic channel that is narrow at the base of the basidia, broader in the middle and open to full size in the upper parts of the basidia. The four sterigmate are characteristically homobasidiomycetous, small, 3–4 µm long, giving rise to asymmetrically attached spores. Basidiospores are ellipsoidal to slightly curved, 4 × 1.5–2 µm, thin- and smooth-walled, and nonamyloid. Germination was not observed.

Specimen was collected at Yangmingshan National Park in Taipei, Taiwan, 300 m, 29.4.1996, leg. Chee-Jen Chen CCJ1446, in herbario TNM in Taiwan. Habitat on decayed wood

 Habitat: null



Boidin, J et al. 1993; Chen, CJ et al. 2004; Eriksson J et al. 1958; Eriksson J et al. 1981; Jülich W. 1978; Langer, G. 1994; Nunez, M and Ryvarden, L. 1997.


C. J. Chen

 Note: The ultrastructure of septal pores and walls of hyphae and basidia here are reported for the first time in a species of Amauromyces. Scattered spongy swellings of walls of basidiomycetous hyphae hitherto were reported only for species of Tulasnella J. Schroet. The unique feature of A. farinaceus is the conspicuous, asymmetrical deposition of cell-wall material in the lower parts of the basidia, showing a fibrous structure in longitudinal sec-tions. The species is identified as A. farinaceus by the conspicuous basidial structures and by the size of basidia, basidiospores and hyphae (Boidin et al 1993). Amauromyces pallidus, the type of genus, differs by larger basidia, smaller basidiospores, and presence of encrusted cystidia (Jülich 1978). Irregularly thickened wall with small cytoplasm channels has not been reported in other species. Dolipores with perforate parenthesomes indicate that A. farinaceus is a taxon of the Homobasidiomycetes. Among the corticiaceous genera containing species with short cylindrical to stoutly clavate basidia, Paullicorticium and Sistotremastrum appear to be most closely related to Amauromyces. When all morphological characters, including basidial structure and ontogeny, cystidia, hymenial hyphal structure, etc. are compared. Species of these genera share thin effused basidiocarps, monomitic hyphal systems and short basidia. In addition, these genera are devoid of cystidia. Apart from the absence of cell-wall thickening in the basidia of Paullicorticium and Sistotremastrum species, these species differ from those of Amauromyces by producing more than four sterigmate per basidium (Eriksson 1958, Eriksson et al 1981). Furthermore, dolipores in Paullicorticium pearsonii (Bourd.) John Erikss. have continuous parenthe-somes. Swelling of the basidial walls in other members of corticiaceous Homobasidiomycetes, namely in Chaetoderma Pharm., Columnocystis Pouz., Gloeosoma (Lév.) Bres., and Velu-ticeps (Cooke) Pat.. The morphology of basidia and structure of basidiocarps of these genera are quite different from those of Amauromyces farinaceus. When other taxonomically important characters, such as basidiocarp features, hyphal systems, hymenial configurations, basidial shapes and spore characters, are considered it is obvious that these genera are not related to Amauromyces. Gloeosoma is related to Aleurodiscus Rabenh. ex Schroet. (Nuñez and Ryvarden 1997); Chaetoderma, Columnocystis (=Veluticeps) to stereoid taxa.