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Page number:90 
Description type:Non-original description 
Description:HYDNELLUM CAERULEUM (Hornem. ex Pers.) P. Karst. -Figs. 121-123
Basidiomes simple or concrescent. Pileus up to 60 mm across, flat to depressed, comparatively even to rough or colliculose, originally velutinous, then felted, finally the tomentum collapsed to form a surface characterized by often sharply raised, reticulately connected fibrils and radiately aligned wrinkles or ridges, not or very indistinctly concentrically zoned; the youngest stages delicately blue-grey (fresh), then whitish to pale buff, from centre outwards with age turning greyish yellow or yellow-brown and finally dark dull brown; the margin remaining whitish for some time, but stained blackish where bruised. Stipe 10-35 x 4-15 mm, simple or connate, cylindrical or with a bulbous base or ventricose, usually very much covered with debris and dirt, plushy, becoming matted, orange-brown. Spines up to 3 mm long, decurrent, crowded, subulate, purplish brown. Context of the pileus up to 5 mm thick in the centre of the pileus, little or not duplex, in young specimens alternately zoned with delicately blue-grey and pallid bands, the latter becoming progressively flushed with orange in age. Context of the stipe duplex, at least in the basal portion; the firmer part blue-grey when young, with age becoming increasingly mottled with orange-brown, finally entirely dingy orange-brown; the tomentum orange to orange-brown. A thin slice of the bluish context staining blue-green in KOH solution, immediately changing to olive green; a slice of the orange context staining olive brown.
Context of the pileus monomitic. Generative hyphae 3-5.5 µm wide, not inflating, thin-walled or with slightly thickened cell-walls, branched, septate, with occasional clamp-connections in the firmer part. Context of the spines similar, hyphae narrower. Basidia 30-33 x 6-7 µm, clavate, with basal clamp only visible in very young stage, 4-spored. Sterigmata 2.7-4.5 µm long. Spores 5.8-6.3 x 4.3-4.5 µm, of irregular outline, tubercular (tubercles numerous, prominent, fairly coarse, flat-topped to somewhat exsculpate), brownish, with oblique apiculus.

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