Читать книгу Identification of the Larger Fungi - Roy Watling - Страница 21

Cap: width 50–100 mm. Stem: width 20–35 mm; length 50–100 mm.

Description: Plate 7.

Cap: yellow-ochre or dull yellow becoming paler with age, or flushed faintly greyish green, convex but soon expanding and becoming flat or depressed in the centre, smooth, or granular when young and slightly tacky in wet weather, faintly striate at the margin.

Stem: white at first then flushed slightly greyish, smooth or wrinkled, firm at first but quickly becoming soft and fragile.

Flesh: brittle, firm at first then soft, white, yellow under cap-centre.

Gills: white at first then flushed pale cream-colour, brittle, adnexed to free, rather distant.

Spore-print: faintly cream when freshly prepared.

Spores: medium-sized, hyaline, broadly ellipsoid or subglobose to almost globose, coarsely ornamented with prominent warts which stain blue-black when mounted in solutions containing iodine and which are faintly interconnected by low ridges, about 8 × 7 µm in size (9–10 × 7–8 µm).

Marginal cystidia: prominent, lance- to spindle-shaped and often filled with oily material.

Facial cystidia: similar in shape to marginal cystidia and projecting some distance from the gill-face.

Habitat & Distribution: Commonly found in mixed woods from summer until late autumn.

General Information: Easily recognised by the ochre-yellow cap, very pale cream-coloured spore-print and greying stem. Two other yellow-capped species of Russula are commonly found. R. claroflava Grove with yellow spore-print and blackening fruit-body which grows with birches in boggy places, and R. lutea (Fries) S. F. Gray which is much smaller, having a cap up to 50 mm and very deep egg-yellow gills and spore-print; it grows in deciduous woods.

Illustrations: F 22a; Hvass 226; LH 119; NB 137¹; WD 49¹.