88 
HYMENOMYCETES 
S. sebacea (seba, tallow—from its tallow-like appearance). 
Forms the familiar crust-like patches on rotten stumps, 
particularly fir. Often encrusting fir-needles, twigs, grass, 
etc. Tinged brown or cinnamon when dry. 
EXOBASIDIUM 
(Ex, out of—from the habit, growing spores on basidia 
without any true sporophore) 
E. vaccinii (from its host, Vactinium). Plate XIV. i. 
Forms globular swellings on living leaves of the Whortle¬ 
berry ( Vactinium myrtillus), rarely on the leaf-stalks and stems. 
The flesh-coloured hymenium protrudes from the under 
surface of the leaf; the opposite upper surface is red or 
purple. An allied species, E. rhododendri, causes large galls, 
varying in size from a pea to a marble, on leaves and twigs 
of rhododendrons, especially Rhododendron fenugineum. Un¬ 
common. 
PENIOPHORA 
(Gr. penion , a shuttle; phero, to bear—from the shuttle-like 
setae (modified cystidia) borne on the hymenium) 
P. incarnata ( incarnatus , flesh-coloured). Plate I. 3. 
Forms broadly effused reddish or orange patches on wood 
and bark; very common on dead gorse and broom. The 
colour is maintained in a dried specimen, which feature 
distinguishes it from P. rosea. In both species the margin 
is whitish and fringed. Common, except in sum. 
HYMENOCHiETE 
(Gr. humen, a membrane ; chaite, a bristle—from the bristly 
hymenium) 
H. rubiginosa (rubigo, rust — from the colour of the 
hymenium). Plate XXX. n. 
Ferruginous brown, often with a purple tinge, foxy rust 
colour within. Variable, quite resupinate, slightly reflexed, 
