191 5] 



OVERHOLTS STUDIES IN THE POLYPORACEAE 



713 



hyphae are not continuous for any distance but break up into 

 numerous smaller branches that are often rapidly narrowed 

 to fine thread-like hyphae. This condition must be seen to be 

 best appreciated. It affords, however, another character on 

 which the species can be separated from those closely allied. 

 The following brief diagnoses of these species is appended : 



1. Polyporus Curtisii 



Berk. 



Plants perhaps al- 

 ways stipitate; pileus 

 renif orm or flabellif orm, 



3-12 X 3-20 X 0.7-2 

 cm., covered with a thin 

 crust that is at least in 

 part ochraceous in ma- 

 ture plants, zonate ; con- 

 text soft and nearly 

 white above, brown and 

 firmer next the tubes, 

 0.5-1.5 cm. thick; tubes 

 0.3-1.2 cm. long, the 

 mouths white to brown- 

 ish, averaging 3-5 to a 



mm.; stipe lateral, with color and context as in the pileus; 

 spores light brown, ovoid with a truncate base, apparently 

 echinulate, 8.5-11.5 X 4.5-7 n ; cystidia none ; hyphae of con- 

 text hyaline or brown, 4-6 n in diameter. 



On and about trunks of deciduous trees. 



Illustrations : Bot. Gaz. 46 : /. 1-3. 



Specimens examined: Ell. N. Am. Fung. 802. — Rab.-Wint. 

 Fung. Eur. 3430.— Mo. Bot. Gard. Herb. 1438 (Louisiana), 

 4746 (Alabama).— Overholts Herb. 305 (Florida), 962, 518 

 (Missouri), 2235 (New York). Also reported from most of 

 the other states east of the Mississippi and south of the Ohio 

 Rivers. 



2. Polyporus lucidus Leyss. ex Fries. 

 Plants sessile or stipitate; pileus dimidiate or reniform, 

 3-12 X 3.5-20 X 0.5-2.5 cm., covered with a thin reddish or 



Fig. 6. Hyphae of P. Tsugae. 



