[Vor. 4 
328 ANNALS OF THE MISSOURI BOTANICAL GARDEN 
Vermont: Middlebury, Е. A. Burt; Ripton, Е. A. Burt. 
Connecticut: West Goshen, L. M. Underwood (in N. Y. Bot. 
Gard. Herb.). 
New York: Albany, С. Н. Peck, in de Thiimen, Мус. Univ., 
804, under the name T'rogia Alni; North Elba, C. Н. Kauff- 
man, 2 (in Mo. Bot. Gard. Herb., 21400). 
Michigan: Isle Royal, Allen & Stuntz, 19, Univ. of Wisconsin 
Herb. 
British Columbia: J. Macoun, comm. by J. Dearness, 3862 (in 
Mo. Bot. Gard. Herb., 12239). 
13. M. gyrosus Burt, n. sp. 
Type: in Mo. Bot. Gard. Herb. 
Fruetifieation resupinate, effused, soft, separable, mem- 
branaceous, the margin cottony, whitish, here 
and there free; hymenium drying Capucine- 
buff, even near the margin, gyrose-plicate in 
the middle region, with the folds but little 
Fig. 11 elevated, obtuse, not forming pores; in struc- 
M. gyrosus. ture 400 y thick, with the folds standing out 
See pl. 20, f. 10. 900-400 u further, composed of interwoven, 
branching, hyaline hyphae 31-4 и in diam- 
eter, nodose-septate, incrusted near the substratum; no 
eystidia; spores hyaline, even, often slightly curved, 
43-5 1-2 д. 
Fructification 3 em. long, 14 em. broad, fractured at both 
ends. 
On rotten birch log. Michigan. August. Rare. 
This species is related to M. fugax, but Из hymenium has 
stouter, more obtuse folds than those of M. fugax, and the 
spores are of the slender, curved type. M. borealis of Lap- 
land has very similar aspect and coloration but with thinner 
folds, non-incrusted hyphae, and longer spores; perhaps 
future collections of M. gyrosus may show that these differ- 
ences are not constant. 
Specimens examined: 
Michigan: Vermillion, А. Н. W. Povah, 7, type (in Mo. Bot. 
Gard. Herb., 9088). 
