[Vor. 4 
342 ANNALS OF THE MISSOURI BOTANICAL GARDEN 
or has the dissepiments grown out into raduloid teeth. The 
layer bearing the hymenium is very thick—2 mm. thick in the 
specimen in Krieger’s Fungi Sax., 420—and is composed of 
intermixed, densely arranged hyphae, both colored and hya- 
line, as shown by Falck in pl. 8, cited above. The colored 
hyphae are not differentiated quite to the hymenium in the 
European specimens which I have examined and do not ex- 
tend quite as near to it in our American specimens cited be- 
low as in the European ones, but all these specimens agree in 
having such a broad, dense layer of fleshy structure; this layer 
appears to be a good histological character for distinguish- 
ing M. lacrymans from other species with colored spores. 
M. americanus has hymenial configuration and coloration like 
M. lacrymans, but is very thin and has its broad layer of in- 
termixed colored and hyaline hyphae next to the substratum 
and with these hyphae loosely interwoven. The raduloid teeth 
develop when growing on an inclined substratum. 
Specimens examined: 
Exsiccati: Bartholomew, Fungi Col, 5036; Krieger, Fungi 
Sax., 120, 420, 1911; Linhart, Fungi Hung., 443. 
Germany: locality not given, R. Hartig, comm. by H. von 
Schrenk (in Mo. Bot. Gard. Herb., 42955); Konigstein, 
Saxony, W. Krieger, in Krieger, Fungi Sax., 120, 420; 
Süchs Schweiz, W. Krieger, in Krieger, Fungi Sax., 
1911. 
Austria-Hungary:  Petrovzseny, С. Linhart, in Linhart, 
Fungi Hung., 443. 
Canada: London, Ontario, J. Dearness (in Mo. Bot. Gard. 
Herb., 9446) and in Bartholomew, Fungi Col., 5036. 
Connecticut: Bridgeport, С. P. Clinton (in Clinton Herb.). 
New York: New York, H. J. Banker (in N. Y. Bot. Gard. 
Herb.). 
Illinois: Cobden, F. S. Earle (in Мо. Bot. Gard. Herb., 
54909). 
New Mexico: Senorito, M. Bletcher, comm. by W. H. Long, 
21454 (in Mo. Bot. Gard. Herb., 54916). 
Arizona: Fort Valley Experiment Station, W. H. Long, 21462 
(in Mo. Bot. Gard. Herb., 54917). 
