¿ii OS 
1 dE La i TI m 
1920] 
BURT—THELEPHORACEAE OF NORTH AMERICA. XII 129 
the general aspect and microscopic structure of specimens are 
usually so similar to S. purpureum that it is distinguishable from 
the latter only by the presence of weak flexuous hairs in the 
hymenium which are not visible until sectional preparations are 
examined with the compound microscope. Such hymenial hairs 
were in 1839 figured by Berkeley, loc. cit., in illustrating the 
hymenium of what he regarded as Thelephora purpurea but 
which now appears to have been S. rugosiusculum. All speci- 
mens in which these hair-like cystidia have been demonstrated 
have been either resupinate or with simple, reflexed portion 
not narrowly lobed or complicate. It has not been possible to 
observe a specimen throughout its whole season of growth to 
determine whether the hair-like cystidia are a constant character. 
In forming the glabrous, rugulose surface upon which the specific 
name is based, the specimens do not become denuded of their 
original tomentose covering, for sectional preparations of such 
specimens, mounted in liquid medium, show this hairy covering 
to be of the original thickness and with the tips of the hairs no 
longer adhering together into a plane surface but now floating 
free. Probably the gluing together of the hairs into a glabrous 
surface is a weather phenomenon. 
Specimens examined: 
Exsiccati: Bartholomew, Fungi Col., 3489, under the name Ster- 
eum purpureum; Cavara, Fungi Longobardiae, 60, under 
the name Stereum purpureum; Ellis, N. Am. Fungi, 323, 
under the name Stereum purpureum. 
Sweden: Stockholm, L. Romell, 33. 
England: M. J. Berkeley, under the name Stereum vorticosum 
(in Kew Herb.). 
France: Fautrey, determined by Patouillard as S. purpureum, 
comm. by Lloyd Herb., 4339, 4363. 
Italy: F. Cavara, in Cavara, Fungi Longobardiae, 60. 
Ontario: London, J. Dearness, in Bartholomew, Fungi Col., 
3489. 
Maine: Morse, comm. by Sprague (in Curtis Herb., 5413, type 
of Stereum Micheneri as emended by Massee); Harrison, 
J. Blake, comm. by P. L. Ricker; Piscataquis Co., W. A. 
Murrill, 1850, 2153 (in N. Y. Bot. Gard. Herb. and Mo. 
Bot. Gard. Herb., 56692, 56693). 
4 
