LYMAN: STUDIES OF HYMENOMYCETES. 
137 
Polymorphism is reported by Patouillard (’83a, ’87a) in three 
species of this family in connection with the basidio-fructification, as 
follows: — 
The hymenium of Pterula multifida Fr. contains cells similar to 
paraphyses, whose upper part is alternately inflated and constricted 
with a wall at each constriction. These enlarged cells may become 
separated, and are doubtless chlamydospores similar to those found 
in Stereum discijorme (see p. 136). 
On the hymenium of Pistillaria rosella Fr., var. ramosa Pat. are 
small tubercles composed of slender, articulate, diverging hyphae, 
each terminated by a large ovoid conidium. 
The sclerotium of Pistillaria bulbosa Pat. may give rise to a pezizoid 
cup bearing a thick layer of two- to three-septate, staff-shaped bodies, 
which become disarticulated as cylindrical conidia. In both species 
of Pistillaria the exact nature of the conidia should be determined by 
culture-study. 
Hydnaceae. — The hymenium of Hydnum coralloides Scop, con¬ 
tains thick-walled microconidia produced endogenously in chains or 
grouped in clusters on branching hyphae (de Seynes, ’91). Macro- 
conidia are also produced terminally on slender conidiophores. 
De Seynes compares the spore formation in this species with that 
seen in Polyporus biennis. Similar spores occur in Hydnum eri- 
naeeus Bull. (Richon, *81, and Patouillard, ’94a). Undoubtedly both 
micro- and macroconidia, so called, are chlamydospores formed in the 
elements of the hymenium or subhymenium, a phenomenon which is 
apparently not uncommon in the Hymenomycetes (c/. Stereum dis¬ 
cijorme, p. 136). 
Brefeld (’89) cultivated species of Grandinia, Radulum, Phlebia, 
and Irpex. Grandinia yielded only sterile mycelia, but Phlebia and 
Irpex formed abundant oidia. The mycelium of Radulum produced 
short side branches with a beaded appearance as in the formation of 
oidium chains, but the parts of the chain did not germinate or separate 
to form oidia. The basidiospores of Radidum laetum (Fries) germ¬ 
inated by the formation of promycelia and secondary spores (cf. 
Pachysterigma, p. 134). 
Agaricaceae. — Oidia are very common in this family, having been 
reported in the majority of the species thus far investigated. In most 
species they germinate readily, and form normal mycelia. Falck 
(’02) cultivated a considerable number of the Agaricaceae through 
