THIRTEENTH REPORT. 
999 
spores.. Stem 4-8 cm. long, 1-2 cm. thick, subequal to ventricose, soft 
and fragile , loosely stuffed then cavernous, i but not from grubs), while, 
rarely tinged with delicate pink, slightly wrinkled, subglabrous. Spores 
subglobose, 7-0 niicr. echinulate, nucleate, bright oclxre-yclloio in muss. 
Taste mild. Odor none. 
Solitary or scattered. In mixed woods of hemlock and beech, among 
beds of white pine needles at N e w Richmond; among grass, etc., in oak 
woods at Ann Arbor, Sept. -Oct. Frequent. 
This very fragile Russula is known from the other members of the 
“Fragiles” group, by its medium size, bright-yellow-ochraeeus spores and 
gills, the hollow, often subventricose stem, the mild taste and the pink- 
ish-yellow to peach-colored pi lens. The stem is sometimes enlarged at 
apex, sometimes at base, always fragile. Very few of our Russulas have 
such bright-colored spores and gills. The color of the cap varies rather 
rarely to a deeper red on the one hand or to ochraceus-.tan and straw- 
color on the other. The tiesli does not change on bruising, and the odor 
is not noticeable even in age. It is very different from R. Integra Fr. 
Quelet, its author, places it under the “Fragiles,” while Massee refers 
it to R. resca as a variety. The only excuse for this seems to be that 
Quelet's plant is said to have a “hard” stem. In this respect our plant 
differs but it is so close otherwise that it has been referred to it. It 
approaches R. ■nitida, and is no doubt the plant usually referred to that 
species in this country. It differs from that species, however, in the 
lack of the nauseous, disagreeable odor, which Bresadola and others 
find to be constant, as well as its average larger size. 
II. OUTLINE OF THE BAS IDIOM YCETES AND ASCOMYCETES. 
I. Mvcelium non-septate. li. e. without cross walls.) Phi/co my cetcs 
^ (A.) 
I. Mycelium septate, li. e. composed of many cells.) II. 
II. Spores usually on a differentiated hymenium III. 
II. Spores not on a differentiated hymenium, not in asci nor on 
basidia Imperfect Fungi. (Not included in keys.! 
III. Spores borne on basidia, usually 4 Basidiomy cetcs. (B.) 
III. Spores borne in asci. usually 8 1 scomyoetes. (0.) 
i B.) BASIDIOM YCETES. 
(a) Basidia not formed on a hymenium, but on short hypliae arising 
from resting-spores. Smuts and rusts. (Not included in the 
keys.) 
(a) Basidia formed on a hymenium (b) 
(bl Hymenium not on a special fruit-body, but developed directly from 
the hypliae which are hidden in the substratum. 
Exobasidii. (Not included in keys.) 
(b) Hymenium developed on a special fruit-body (c) 
(c) Hymenium exposed on the surface of (he fruit-body. 
Hymenomycetes. (d) 
(c) Hymenium concealed within the fruit-body till spores are mature. 
(See 10th Report Mich. Acad, of Sci. p. 03). Gasteromycetes. 
