100 
HYMENOMYCETES 
about the roots of decaying trees, stumps, etc., especially 
pine. A dangerous parasite, see notes on p. 28. 
F. ferruginosus ( fevvum , iron—from its rusty colour). 
Plate XXXIII. 4. 
Broadly effused and closely adnate, J-J in. thick, some¬ 
times with reflexed margin, bright ferruginous-brown at 
first, darker when old. Por. subrotund, sometimes torn, 
long. F. almost obsolete. Common on trunks, especially 
the under surface of dying oak branches not detached from 
the tree ; sometimes forming patches 2 ft. in length. 
F. ribis ( ribis , currant) forms the well-known sporophores 
on old currant and gooseberry bushes, F. ulmarius ( ulmus , 
elm), the effused whitish strata on old elms, and F. fvaxineus 
( fvaxinus , ash), the large, strong-smelling, reddish-brown 
sporophores on old ash trunks. 
POLYPORUS 
(Gr . polus, many; povos, a tube—from the many pores of the 
hymenium) 
P. Schweinitzii (after Ludwig David von Schweinitz). 
Plate XIII. 6. 
P. 4-12 in., hairy, dark brown; margin at first yellowish- 
green ; when old and dry, reddish-brown. F. thick and 
spongy at first, becoming dry and bright brown. T. in. 
long. Por. large and very angular, often elongate and sinuous, 
yellow with a tinge of green, becoming brownish when 
bruised, reddish-brown when dry. S. usually central and 
distinct. Spore mass pure white. Not uncommon in the 
South of England at the base of living larch trees. A deadly 
parasite. The stem is not invariably central, and sometimes 
is quite obsolete. When growing within a hollow trunk, it 
is often attached by a broad lateral base, and the pilei 
growing into one another form a huge tuft. I have seen 
specimens 15 in. diam., and as many in depth at the base. 
