630 MUCRONELLA. HYDNTJM 



and then more or less connate at the base. Spores white, oblong, or 

 subglobose, smooth, or punctate; basidia with 1-4-sterigmata. Cys- 

 tidia present. Growing on wood. 



2132. M. calva (A. & S.) Fr. Calva, bald. 

 Spines white, then pale, 1-3 mm. long, scattered, rigid, thin. Spores 



white, "oblong, hardly depressed, 4-6 x 3/x. Hyphae thin walled, 

 3-6 p, emerging in a sterile bundle" Bourd. & Galz. Rotten pine 

 stumps. Sept. Oct. Rare. 



2133. M. aggregate Fr. Aggregate, clustered. 

 R. '5-2 cm., white, then pale, subiculum absent, or occasional. Teeth 



subulate, short, free, arranged in groups. Spores hyaline, elliptical, 

 4-6 x 2-5-4 /A; basidia cylindrical or clavate, 10-20 x 3-5-5 /A. Hyphae 

 2-4 ju, in diam., thin walled, clamp connections sparse. Very old 

 rotten logs. Oct. Rare. 



Hydnum (Linn.) Fr. 

 (vSvov, the old name for truffles.) 



Receptacle fleshy, coriaceous, or corky, simple, or branched, pileate, 

 or coralloid, stipitate, or sessile. Stem central, lateral, or none. Spines 

 subulate, acute, distinct at the base. Flesh white, or coloured. Spores 

 white, or coloured, elliptical, oval, globose, subglobose, or angularly 

 globose, smooth, granular, verrucose, or echinulate ; basidia with 2-5- 

 sterigmata. Cystidia present, or absent. Micro- and macro-conidia 

 present in some species. Growing on the ground, or on wood. 



I. St. central. 

 A. P. fleshy. 

 *Spores white. 



2134. H. repandum (Linn.) Fr. Grev. Scot. Crypt. Fl. t. 44. 



Repandum, bent backwards. 



P. 5-15 cm., pale buff flesh colour, or subrufescent, convex, somewJiat 

 repand, often irregular and excentric, smooth, or minutely floccose 

 and pruinose, firm; margin often lobed. St. 3-12 x 1-5-4 cm., white, 

 or pallid, ochraceous at the base, irregularly shaped. Spines white, then 

 flesh colour, 4-8 mm. long, decurrent, unequal, conical, entire, rarely 

 bifid, or tubular, brittle. Flesh white, firm, fragile, thick. Spores 

 white, subglobose, apiculate, 6-7 x 5-6/M. Smell pleasant. Taste 

 bitter. Edible. Woods. Aug. Nov. Common, (v.v.) 



var. album Quel. Album, white. 



Differs from the type in the milk white pileus. Woods. Sept. Oct. 

 Uncommon, (v.v.) 



