1 8 SOUTHERN POLYPORES 



isabelline to latericeous; margin acute, thin, inflexed, entire or 

 undulate, often obtuse with age; context very thin, white, 

 fibrous, 1-2 mm. thick; tubes white, 2-4 mm. long, slender, 

 mouths minute, circular to angular, regular, even, 6 to a mm., 

 edges thin, entire, white to pallid, becoming discolored with 

 age ; spores globose, 3-4.5 M- 



Frequent on water-soaked deciduous trunks in the warmer 

 portions of the Gulf states. 



10. PORODISCULUS Murrill 



Hymenophore small, annual, tough, epixylous, erumpent from 

 the lenticels of dead branches; stipe attached to the vertex of 

 the pileus, usually curved at maturity; context white, fibrous; 

 tubes cylindric, short, one-layered, mouths constricted; spores 

 globose, smooth, hyaline. 



i. PORODISCULUS PENDULUS (Schw.) Murrill 



Pileus very small, turbinate-cup-shaped, attached at the 

 vertex, soon decurved and pendant, gregarious, erumpent from 

 the lenticels of dead branches, 1-2 mm. broad, 3-5 mm. long; 

 surface anoderm, azonate, smooth, umbrinous, uniformly covered 

 with a brown powder, often ashy-white with age; margin inflexed, 

 concolorous, sterile; context white, fibrous, very thin; tubes very 

 short, annual, white within, mouths circular, constricted, white, 

 pruinose, becoming concolorous, 6-7 to a mm., edges entire; 

 spores globose, 4;*; stipe 2 mm. or less in length, vertically 

 attached, gradually expanding into the pileus, which it resembles 

 in surface and context. 



Frequent throughout on fallen dead twigs of various deciduous 

 trees and occasionally on red cedar. Common in some localities 

 on dead chestnut, chestnut-oak, and sumac. 



ii. HEXAGONA Pollini 



Hymenophore small, annual, epixylous, flabelliform to reni- 

 form, rarely circular, stipitate, the stipe sometimes much reduced; 

 surface smooth or tessellate, margin thin; context thin, white, 

 fibrous, fleshy to tough, usually fragile when dry; hymenium of 

 radiating rows of large, thin-walled, hexagonal tubes, usually 

 radially elongate; spores smooth, hyaline. 



Tubes unequally hexagonal, the radial walls longer. 



Pileus reniform; stipe much reduced. I. H. alveolaris. 



Pileus flabelliform ; stipe usually quite distinct. 2. H. daedalea* 



Tubes equally hexagonal. 3. H. cucullata. 



