Search on : Taxa descriptions


 Add this item to the list  Polyporus arcularius Batsch ex Fries
Page number:213 
Description type:Culture description 
Description:Polyporus arcularius Batsch ex Fries
Culture examined: FRI 696 : Polysporous, Isolated from 7599 on unknown fence post, causing white rot.
Growth characters. - Rate of growth moderately rapid, the radius at 1 week 3.8 cm., at 2 weeks 7.7 cm. Advancing zone even, hyaline and appressed. Mat at first short-cottony, floccose, subfelty, white, after 2 weeks patchy, in some areas remaining as described above, in other areas felty to skinlike and coloured `vinaceous-buff', 'avellaneous' and `light cinnamon-drab', mottled, after 3 weeks felty to skinlike areas increased, `cinnamon buff', `light cinnamon-drab', `cinnamon drab', `deep brownish drab' and `benzo brown', white areas woolly-felty to felty, after 4-5 weeks most of the mat felty to skinlike, cartilaginous and coloured 'wood-brown', 'cinnamon-drab', `brownish drab', `dark vinaceous-drab', `seal brown' and `mars brown' with some islands remaining white, woolly-felty to felty. Reverse patchy, slightly bleached in some areas, remaining areas either unchanged and reflecting the colours of the mat or becoming brown after 4 weeks. Odour slight.
Tests for extracellular oxidase positive: on gallic acid agar diffusion zones very strong with no growth; on tannic acid agar diffusion zones strong, diameter 3.8 cm; with guaiacum reaction very strong.
Hyphal characters. - Advancing zone: hyphae hyaline, thin-walled, nodose-septate, branched, 1.8-3.7 µm in diameter. Aerial mycelium: (a) hyphae as in advancing zone; (b) fibre hyphae numerous, with walls thick and refractive, lumina narrow or apparently obliterated, frequently branched, 1.2-1.8 µm in diameter; (c) hyphae from skinlike areas nodose-septate, thick-walled with lumina frequently lacking, with numerous short branches and knob-like projections interlocking so coherently that it is almost impossible to separate them. Submerged mycelium: hyphae as in advancing zone.
This fungus has been described in culture by Nobles (1948). She described the chlamydospores as rare or apparently lacking. In the present isolate chlamydospores were not observed.
P. arcularius is very close to P. brumalis in culture except that the colour of the mat is darker in the former than in the latter.
Taxon name: