large loose scales, and that the longer, larger tubules are not easily sepa¬ 
rable from the cap. 
Boletinus. Differs from Boletus in that the tubules are not easily 
separable from the cap ; and from Strobilomyces in that there is appar¬ 
ent radiation in the arrangement of the pores. 
Gyrodon. Tubules, as in the last two, not easily separable from the 
cap ; but they are short and sinuous or with twisted folds. 
Fistulina. Fleshy; stem wanting or lateral; tubules individually 
distinct. 
Polyporus. Tubules in a distinct stratum, but not separable from the 
cap, preformed, not in successive layers; fleshy or tough (not wood}), 
sessile, stipitate. 
Fomes. Tubules as in the last, usually stratose (in successive layers); 
from the first woody, sessile. 
Polystictus. Tubules as in Polyporus, but at first superficial, growing 
in length and distinctness, least developed near the margin of the cap ; 
leathery or membranaceous. 
Poria. Tubules as in Polyporus or Polystictus ; resupinate, effused; 
no true pileus; waxy-leathery or membranaceous. 
Trametes. Tubules sunk to unequal depths in substance of cap, not 
forming a distinct stratum, subcylindrical; corky, not stratose, sessile. 
Daedalea. Tubules as in the last, but sinuous to labyrinthiform; 
corky, not stratose, sessile. 
Cyclomyces. Tubules replaced wholly or in part by concentrically 
arranged lamellae; leathery, with or without a central stem. 
Favolus. Pores alveolar, more or less radially disposed, fleshy-tough, 
stem usually lateral, not well developed. 
Merulius. Pores shallow, irregular, formed by a mesh of fleshy 
radiating folds ; resupinate, effused, waxy-membranaceous or gelatinous. 
Porothelium. Tubules distinct, appearing first as papillae which rise 
separately from a mycelial mat, then elongate and tubular; resupinate, 
membranaceous. 
Solenia. No true receptacle; tubules individually distinct, membrana¬ 
ceous, crowded, closed at first. 
Fam. III. HYDNACEAE. 
Hydnum. Fleshy or corky, sometimes resupinate, horizontal; teeth 
awl-shaped or needle-shaped, free, acute. 
Hericium. Fleshy, clavate (cf. Clavaria), tips clothed with the spines. 
Tremellodon. [See Tremellaceae]. 
Sistotrema. Fleshy or membranaceous ; teeth discrete from the pileus, 
broadened into plates irregularly arranged. 
Irpex. Leathery or woody ; teeth concrete with the pileus, and con¬ 
nected at the base, regularly arranged, but not uniform in shape. 
Radulum. Resupinate; with irregular, subcylindrical, obtuse tubercles. 
Phlebia. Resupinate, fleshy; hymenium corrugated in crests, folds or 
ridges. 
Grandinia. Resupinate; hymenium even, but rough with persistent 
granules. 
Odontia. Resupinate, dry, woven of fibres; covered with granules that 
are finely multifid or crested. 
Kneiffia. Resupinate, floccose ; covered with minute stiff spines. 
Mucronella. Pileus wanting; spines slender, pointed, vertical. 
