THE POLYPORACEAE OF WISCONSIN. 31 



The species may be recognized by the soft, white conchate pilei and 

 the thin gelatinous, partly separable hymenial layer. 



Specimens have been found near Madison, Elkhorn, Bangor, Shana- 

 golden and Star Lake. 



5. PAVOLUS Fries. 



Hymenium reticulate-cellular to alveolate. Alveoli formed from 

 densely anastomosing lamellae, radiating from the point of attachment. 

 Spores white. Fungi dimidiate, substipitate, fleshy tough, annual. 



This genus differs from others in the form of its pores produced by 

 the anastomosing lamellae. 



Pavolus europaeus Fries. (Plate I, fig. 6). 



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

 eral; alveoli deep, reticulate, subrotund; spores 12 x 4 microns. 



Macbride (15, p. 6) says among other things that "they are not 

 exactly in concord with the above description. Our specimens are 

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

 might be described as appressed-squamose or fibrillose, and in these 

 respects conform to descriptions of F. boucheanus Kl. The latter 

 again seems not to differ from F. canadensis of the same author". 



Specimens found in Wisconsin vary in color. Young and grow- 

 ing specimens are usually of a pale tan color. Sometimes the color 

 is of a deeper brownish but scarcely orange. Old bleached specimens 

 are white. The color of the hymenium is usually the same as that of 

 the pileus. The fibrillose scales are not always present. The form 

 of attachment may be sessile, lateral stiped or resetted, and occasion- 

 ally cxcentrically stiped. The stipe when present is, however, always 

 very short. 



F. europaeus is one of our most common types of polypores, having 

 been collected in every county visited so far. The most favorite sub- 

 stratum is a hard wood stick lying on the ground especially oak and 

 hickory branches. 



The largest specimen measured is 10 cm. broad and 8 cm. long. The 

 pileus is only a few mm. thick, while the pores are about 4-5 mm. deep. 

 The largest pores measured were about 3 mm. long and 2 mm. wide. In 

 size however they vary very much in the different specimens. 



Sometimes there is more or less of a depression at the point where 

 the stipe is attached. 



