THELEPHORACEiE 
89 
or broadly reflexed and densely imbricated. Margin brighter. 
Sometimes little pilei appear to spring from the adnate 
portion between the reflexed edges. Perennial, on gate¬ 
posts, etc. Throughout the year. Common. 
CORTICIUM 
(Cortex , bark—from the usual habitat) 
0 . salicinum (salix, willow—from the usual habitat). Plate 
XXX. I. 
Sph. J-i in., leathery at first, rigid when dry, fixed by the 
centre with a raised margin all round. H. blood-red, 
whitish and somewhat hairy below. Gregarious on willow 
(rarely poplar) in aut. Resembles a Peziza. 
C. calceum {calx, lime—from the chalk-white colour), 
common in sum. and aut. on dead wood and branches, 
margin determinate. C. lacteum [lac, milk—from the milk- 
white colour) is a winter species, with radiating fringed 
margin, frequent on dead trunks. C. sambuci (from the 
habitat; elder, sambucus ) forms the familiar pure white 
patches effused on dead elder. C. ccevulemn [cocruleum, 
azure-blue), a winter species, is easily recognised by its 
beautiful dark satiny-blue colour. 
STEREUM 
(Gr. stereos, hard—from its hard substance) 
S. hirsutum {hirsutus, hairy—from the strigose hymenium). 
Plate I. 9. 
One of the commonest, most conspicuous and most 
variable of species, usually appearing as bright yellow 
patches on trunk and branches. Quite resupinate when 
growing beneath a log, resupinate with a free margin when 
growing from a vertical matrix, and often with a central 
stem-like base when growing on the top of a prostrate log. 
P. coarsely strigose, dingy yellow, more or less zoned, 
