5 NATURAL HISTORY BULLETIN. 



IV. FAVOLUS. 



Pileus dimidiate, or orbicular and substipitate, annual, soft, 

 fleshy; pores reticulate-cellular,- alveolate, the alveoli, formed 

 of rather densely anastomosing lamella?, radiating from the 

 point of attachment. 



1. Favolus europ.^us Juries. 



Pileus fleshy soft, thin, orbicular, smooth, white; stipe short, 

 lateral; alveoli deep, reticulate subrotund; spores 12x4. 



Our specimens agree perfectly with those distributed in 

 N. A. F., No. 604; nevertheless they are not exactly in con- 

 cord with the above description. Our specimens are yellow 

 or orange above, white below and while not scaly yet might 

 be described as appressed-squamose or iibrillose, and in these 

 respects conform to descriptions of J^. houcheanus Klotsch. 

 The latter species again seems not to differ from F. canadensis 

 of the same author. Winter however recognizes the N. A. 

 F. specimens as F. curopLBUs of Fries, figures it as typical; so 

 that it becomes doubtful whether or not all the species men- 

 tioned, with F. ahitaccus Berkeley and Montagne, should not 

 be called by the same name, F. eiiropcEus. Our specimens vary 

 greatly in size and general characteristics; from one to six 

 centimeters in width. Some are dimidiate or nearly so; most, 

 obsoletely stipitate; some are entire, orbicular, others lobed. 

 One is infundibuliform with the stipe almost central. The 

 size of the alveoli seems also subject to much variation, also 

 the size of the spores. The fibrillaj are adolescent characters; 

 old, weathered specimens are white or, as Winter puts it, 

 whitish (weisslich). 



Common everywhere on fallen twigs and branches, chiefly 

 on hickory and oak. 



2. Favolus rhipidiuim Berkeley. 



Pileus coriaceous, reniform, concentrically sulcate, alutace- 

 ous or white, cuticle seceding in small furfuraceous areoles; 

 stipe lateral, short, tapering downward, pruinose, becoming 

 yellow when dry; pores small, white, angular, denticulate. 



