Search on : Taxa descriptions


 Add this item to the list  Polyporus sulphureus Bull. ex Fries
Page number:380 
Description type:Culture description 
Description:Polyporus sulphureus Bull. ex Fries
Cultural characters: (Pl. XIII, Fig. 5; Pl. XIV, Figs. 12 to 15).
Growth characters. Growth moderately rapid, plates covered in three to four weeks. Advancing zone even, appressed, with scattered tufts of mycelium over zone of newest growth, 1.0-2.0 cm. broad. Mat white to "pale ochraceous-buff" (8.5YR8.0/3.5) and "pale ochraceous-salmon" (9.0YR8.2/2.5), slightly raised, floccose-farinaceous. Reverse unchanged. Odor none. On gallic and tannic acid agars no diffusion zones, colonies 3.0-4.0 cm. diameter on both media.
Hyphal characters. Advancing zone: hyphae hyaline, with simple septa, 3.0-9.0 µm diameter. Aerial mycelium: (a) hyphae as in advancing zone, usually 3.0-6.0 µm diameter, the few broader hyphae conspicuous; (b) conidiophores numerous, making up most of aerial mycelium, 2.2-3.0 µm diameter, branched in spraviike manner, bearing a single conidium at end of each branch; (c) conidia numerous, thin-walled, broadly ovoid to subglobose, 6.0-9.0 x 6.0-7.5 µm; (d) chlamydospores fairly numerous, with walls slightly thickened, terminal and intercalary, 12.0-19.5 x 7.5-13.5 µm. Submerged mycelium: (a) hyphae as in advancing zone; (b) Chlamydospores as in aerial mycelium.
Type of rot: brown cubical rot of broad-leaved and coniferous trees.
Descriptions of cultural characters: Badcock (3), Cartwright and Findlay (51, 53, 54, 56), Davidson, Campbell, and Blaisdell (64), Davidson, Campbell, and Vaughn (67), Fritz (74), Humphrey and Siggers (92).
Fritz (74) and Davidson, Campbell, and Vaughn (67) considered all the secondary spores of Polyporus sulphureus to be chlamydospores, although they noted that those borne on the aerial mycelium are smaller than those produced on the submerged hyphae. On the other hand, Cartwright and Findlay (53) called the spores on the aerial mycelium conidia, and this interpretation has been followed in the above description, while the larger spores of the submerged mycelium have been considered as typical chlamydospores. However, to meet the possibility of the secondary spores all being taken as chlamydospores, key patterns for the species are included, which show only chlamydospores, and both chlamydospores and conidia. Each of the four resulting key patterns occurs alone in the key so there should be no difficulty in determining cultures of P. sulphureus.
Taxon name: