Search on : Taxa descriptions


 Add this item to the list   Polyporus pubescens Schum. ex Fries
Page number:374 
Description type:Culture description 
Description:Polyporus pubescens Schum. ex Fries
Cultural characters: (Pl. XI, Fig. 12; Pl. XII, Figs. 42 and 43).
Growth characters. Growth rapid, plates covered in two weeks. Advancing zone even, with cottony, radiating mycelium extending to limit of growth. Mat white, newest Growth cottony, then uniformly felty, more or less pitted, peeling from agar in coherent pellicle, in F7531 growing up side of Petri dish and there forming grayish, translucent, spongy masses without organized pores but producing spore deposits after five weeks. Reverse unchanged or bleached. No odor. On gallic and tannic acid agars diffusion zones moderately strong, no growth on gallic acid agar, colony 3.0-4.0 cm. diameter on tannic acid agar.
Hyphal characters. Advancing zone: hyphae hyaline, nodose-septate, 1.5-4.5(-7.5) µm diameter. Aerial mycelium: (a) hyphae as in advancing zone; (b) fiber hyphae numerous, with walls thick and refractive, lumina narrow or apparently lacking, branched, the numerous branches usually at right angles to the main hypha, ending in whiplashlike ends, 1.5-3.0 µm diameter. Submerged mycelium: (a) hyphae as in advancing zone; (b) crystals numerous, needlelike.
Type of rot: white rot of broad-leaved trees.
Descriptions of cultural characters: Davidson, Campbell, and Blaisdell (64).
In three of its four positions in the key Polyporus pubescens coincides with one or more other species having identical key patterns. In the inserted descriptive keys, attempts have been made to separate these on the basis of distribution of fiber hyphae and topography of the mats, but no differences were observed whereby cultures of P. pubescens and P. hirsutus could be satisfactorily distinguished.
Taxon name: