[Vor. 4 
314 ANNALS OF THE MISSOURI BOTANICAL GARDEN 
allel, hyaline hyphae with walls gelatinously modified, the sub- 
hymenial portion of the layer usually Isabella-color and 
granular in preparations stained with eosin; cystidia even 
or incrusted, sparingly present, 34—44 џ in diameter, emerg- 
ing 15-25 д above the basidia; spores hyaline, even, allantoid, 
biguttulate, 3—84 4-1 и. 
Fructifications 2-6 em. in diameter, often laterally con- 
fluent, sometimes imbricate, the reflexed margin varying up 
to 14 em. broad. 
Common on decaying logs and stumps of birch, maple, and 
other frondose species, rarely on coniferous wood. Every- 
where in North America. August to January. 
Fully developed specimens of M. tremellosus may usually 
be recognized by their occurrence on frondose wood, reflexed, 
white, tomentose pileus, large pores often with short, trans- 
verse veins or partition at the base, thick, gelatinous-carti- 
laginous flesh, and small, more or less curved spores. Such 
specimens, when dry, usually require an interval of three to 
five minutes after water is applied before the dried, horny- 
gelatinous layer will soften for sectioning, but immature 
specimens soften more quickly. Wholly resupinate fructi- 
fications have the same character as the resupinate portion 
of reflexed specimens, with which they are usually associated. 
When growing on a vertical surface the folds may show a 
tendency to become dentate or irpiciform. 
Specimens examined: 
Ехвіссай: Bartholomew, Fungi Col, 2844 (in сору in Mo. 
Bot. Gard. Herb., not Phlebia radiata as stated on emended 
label), 4437, 4941; Cavara, Fungi Longobardiae, 159; Ellis, 
N. Am. Fungi, 507; Ell. & Ev., Fungi Col., 213; Klotzsch, 
Herb. Viv. Мус., 110; Krieger, Fungi Sax., 1013, 1013b; 
Ravenel, Fungi Car. 2: 22, under the name M. incarnatus, 
3: 15; Ravenel, Fungi Am., 715; Sydow, Myc. Germ., 1204; 
de Thiimen, Мус. Univ., 2205. 
Finland: Mustiala, P. 4. Karsten, in de Thiimen, Мус. Univ., 
2205. 
Sweden: Femsjó, E. 4. Burt. 
Germany: Forbach, А. Ludwig, in Sydow, Мус. Germ., 1204; 
