Investigations on the fungal flora of spruce and pine stumps

Abstract

The fruiting bodies of C.laeve are several cm across, roundish, latercoalescing, soft and separable from the substrate.The colour is variable, brownish, light brownish-gray yellow to a gray brownwith a whitish, samewhat hairy margin.Upper surface smooth often cracked.Basidia 25-40-90 X 45.:_9 fl; spores obovate, sometimes slightly bent at the base 7-9-r2 X 45-7 fl (Bourd.and Galz.).In the hymenium there are also fusiform cystidiola, samewhat longer than the basidia. Cultural charactersC. laeve has been described in culture by RoBAK (r942).Growth is moderately rapid to rapid, 5-9 cm in ro days.Advancing zone even, hyaline.Mat at first thin, hyaline, downy, the aerial mycelium extending to the limit of growth.After a short time the mat is denser, raised, cottony, remaining appressed and nearly translucent in the central part of the colony.Colour at first white, then slightly leather coloured, darker on the edges of the dishes or on the top of the slant in test-tubes.Reverse unchanged to chamois.Odour none or slightly fungal.No diffusion zones on gallic acid and tannic acid agars; growth on gallic acid agar 7-r2 mm, on tannic acid agar ro-r s mm.Hyphae in the advancing zone hyaline, 1.5-4 fl in diameter with numerous clamp connections even on the aerial mycelium.Aerial mycelium of irregularly interwoven hyphal masses; narrow fibre hyphae 4-5 (6) fl in diameter, without clamp connections, branching occurs.No oidia or ,chlamydospores were found.No fructifications formed in culture.Corticium laeve in culture macroscopically has a rather typical growth form and colour but microscopically it is difficult to characterise and is distinguished almost by the absence of any special microscopic feature.3 Grandinia farinacea (Pers.)Bourd.and Galz.