Hymenogaster and related genera.pdf - MykoWeb

654 ANNALS OF THE MISSOURI BOTANICAL GARDEN
[VOL. 21
face smooth; peridium composed of homogeneous, hyaline
prosenchyma with a darker rind of a more compact prosenchyma,
120-160 /L thick when fresh, drying 100-130 ,p; gleba with
large cavities, almost white to grayish-brown, drying cinnamon-buff;
septa 20-35 p thick, prosenchymatous; basidia clavate,
18-25 x 6-8 a%, 2-spored, sterile basidia common as figured
by Tulasne for H. citrinus, sterigmata very short (about 2-3 /%
long), stout; mature spores 24-30 x 13-15 /,f dark brown, ovoidellipsoid
to broadly fusiform, thick epispore with a longitudinally
wrinkled utricle which flakes off, immature spores longcylindrical
to lanceolate or narrowly fusiform, 26-40 x 7.4-
10.5 ,, smooth. Odor like cheese (fermentation).
Under Quercus. Oregon. April.
This species resembles H. vulgaris in color of the fructification
and utricle of the spores, but differs in several other
respects.
OnemoN: Benton County, Corvallis, L. M. Boozer, type (Oregon State, Dodge,
and Zeller 2286).
23. HYMENOGASTER NIVEUS Vittadini, Monogr. Tuberac. 24.
1831; Tulasne, Fung. Hypog. 65. 1851; Winter in Rabenhorst,
Krypt.-Fl. Deutschl. ed. 2. 1: 876. 1883; DeToni in Sace. Syll.
Fung. 7: 172. 1888; Soehner, Hedwigia 64: 192-202. 1923.
Illustrations: Fourquignon, Champ. Super. 123. f. 93; Soeh-
ner, Hedwigia 64: 196; Vittadini, Monogr. Tuberac. p1. 4, f. 9.
Type: material from Vittadini in Berk. Herb. at Kew, and
in Lloyd Mus.
Fructifications about 1 cm. in diameter, subspherical, dry-
ing somewhat irregular, snow-white, reddening to the touch
when fresh, drying ochraceous-tawny to buckthorn-brown or
even darker, sterile base evident; peridium 300-320 ,u thick,
drying 60-110 a, composed of compactly woven hyphae (pros-
enchyma in islands) with larger varicose hyphae 5-6,u in diam-
eter; gleba light fuliginous, becoming very dark brown, cavi-
ties large; septa thin, 15-20 p thick, composed of slender, com-
pact, gelified hyphae; basidia 2-spored, pyriform, 8-9 x 5-6 a,
projecting above the septa, not numerous and early collapsing,
so that the sterigmata appear to arise directly from the septal