[Vol. 7 

 156 ANNALS OF THE MISSOURI BOTANICAL GARDEN 



of the umbo, at first densely tomentose and drying warm bufT to 

 tawny olive, at length weathering to pale smoke-gray to neutral 

 gray and sometimes with the tomentum torn apart in narrow 

 zones and showing the hazel or chestnut surface of the bared 

 areas, the margin normally entire; in structure 400-700 ^ thick, 

 with the intermediate layer composed of very densely arranged, 

 hyaline hyphae 4 ju in diameter and bordered on the upper side 

 by a broad dark zone which bears the tomentum of the upper 

 surface; hymenium glabrous, usually warm buff to cinnamon- 

 buff, sometimes assuming violaceous tints; no cystidia, gloeo- 

 cystidia, nor conducting organs; spores from spore collections 

 white, even, flattened on one side, 5|-7^X2|-3 (x. 



Fructifications 2-7 cm. in diameter, often laterally confluent. 



On logs and stumps of Quercus and other hardwood species. 

 Common throughout North America from Canada southward, 

 in the West Indies, and in South America; occurs also in Norway, 

 Sweden, Formosa, and Java, although apparently rare in the 

 Old World. In vegetative condition from June onward in the 

 north, persisting throughout the year. 



Specimens of S. fasciatum may be distinguished from those of 

 the less common S. lobatum by the thicker tomentose covering 

 of the former, which may continue unbroken throughout the 

 year or become torn apart so as to show rather few and narrow, 

 bared chestnut zones; the pileus of S. fasciatum is thicker than 

 that of S. lohatum, and the margin has a lobate tendency but 

 rarely. Towards the northern part of its range where I have 

 observed the development of fructifications throughout the 

 season, the fructifications are at first effuso-reflexed with the 

 resupinate portion up to 1 cm. broad, the reflexed portion 1| 

 cm. from base to margin, and with a lateral extent along the 

 substratum of 2-8 cm.; umbos soon form at points 1-2 cm. 

 apart along line of intersection of the plane of reflexed portion 

 with the substratum; by further growth outward of the laterally 

 confluent pilei these umbos become the final points of attach- 

 ment of the pilei with the substratum. In Washington and 

 California the fructifications may continue broadly reflexed 

 when old and are difficult to distinguish from luxuriantly grown 

 S. hirsutum. 



The specimens from Formosa, cited below, are in the stage in 



