Marginal cystidia: in bundles and encrusted with amorphous brown, oily material. Facial cystidia: similar in shape and morphology to marginal cystidia. _Habitat_ & _Distribution_: Found on the ground accompanying larch trees either singly or more often in rings or troops. _General Information_: This fungus is easily recognised by the poorly developed ring, overall golden-yellow colour and pale yellow viscidness on the cap which comes off on to the fingers when the fruit-body is handled. There are several closely related fungi which also grow with coniferous trees, e.g. _Suillus luteus_ Fries, ‘Slippery jack’, but many need experience in order to identify them. All these fungi were formerly placed in the genus _Boletus_, because of the fleshy fruit-body with pores beneath the cap. The larch-bolete receives its common name from the close relationship of the fungus with the larch. On drying _S. luteus_ and _S. grevillei_ may strongly resemble one another but the former can be distinguished when fresh by the chocolate brown, sepia, or purplish brown cap and the large whitish, lilac-tinted ring. [Illustration: Plate 1. Fleshy fungi: Spores borne within tubes] [Illustration: Plate 2. Fleshy fungi: Spores borne within tubes] Species of _Suillus_ are edible and rank highly in continental cook-books, although they have disagreeably gelatinous-slimy caps, a character, in fact, which helps to separate them from other fleshy pore-fungi. _Illustrations_: F 41a; Hvass 257; ML 187; NB 104⁴; WD 84². ~Boletus badius~ Fries Bay-coloured bolete _Cap_: width 70-130 mm. _Stem_: width 34-37 mm; length 110-125 mm. (36-40 mm at base). _Description_: Plate 3. Cap: hemispherical, minutely velvety, but soon becoming smooth and distinctly viscid in wet weather, red-brown flushed with date-brown and darkening even more with age and in moist weather to become bay-brown. Stem: similarly coloured to the cap but paler particularly at the apex, smooth or with faint, longitudinal furrows which are often powdered with minute, dark brown dots. Tubes: adnate or depressed about the stem, lemon-yellow but immediately blue-green when exposed to the air and with angular, rather large similarly coloured, pores which equally rapidly turn blue-green when touched. Flesh: strongly smelling earthy, pale yellow but becoming pinkish in centre of the cap, and blue in the stem and above the tubes when exposed to the air, but finally becoming dirty yellow throughout. Spore-print: brown with a distinct olivaceous flush. Spores: long, spindle-shaped, smooth, honey-coloured under the microscope and greater than 12 µm in length (13-15 µm long × 5 µm broad). Marginal cystidia: numerous, flask-shaped and slightly yellowish. Facial cystidia: scattered and infrequent and similar to marginal cystidia in shape.