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 Add this item to the list  Polyporus adustus Willd. ex Fries
Page number:212 
Description type:Culture description 
Description:Polyporus adustus Willd. ex Fries
Culture examined: FRI 646 : Polysporous, Isolated from 7417 on Populus sp., dead tree, causing white rot.
Growth characters. - Rate of growth rapid, the radius at 1 week 6.15-6.65 cm. Advancing zone even, slightly raised aerial mycelium extending to limit of growth. Mat at first cottony-woolly, floccose, in some areas thin and translucent, white, after 2-3 weeks, woolly-floccose to woolly-felty, white or with tinge of 'cream-buff', after 4-5 weeks collapsed and thin felty so thin as to be translucent. Reverse after 1-2 weeks slightly bleached, after 3-4 weeks bleached. Odour slight, faintly fragrant.
Test for extracellular oxidase negative to positive: on gallic acid agar diffusion zones very weak, diameter 2.3-2.5 cm; on tannic acid agar diffusion zones lacking, with no growth; with guaiacum reaction strong.
Hyphal characters. - Advancing zone: hyphae hyaline, nodose-septate, thin-walled, branched, 2.2-4.9 µm in diameter. Aerial mycelium: (a) hyphae as in advancing zone: (b) oidia formed by fragmentation of nodose-septate hyphae or simple-septate branches, 1.8-3.7 µm in diameter, 2.5-14.6 µm long: (c) chlamydospores fairly common, terminal or intercalary, 4.3-7.3 x3.04.9 µm. Submerged mycelium: hyphae as in advancing zone.
References : Cartwright (1931), Cartwright and Findlay (1942, 1958), Nobles (1948) and Bagchee, Puri and Bakshi (1954).
Chlamydospores were observed by Cartwright (1931). Nobles (1948) described only oidia. In the present study both oidia and chlamydospores were found.
The fungus is characterised in culture by the rapid rate of growth, white mat with a tinge of 'cream-buff' colour, negative to weak tests for extracellular oxidase and presence of oidia and chlamydospores.
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