CONTEXT AND PORES WHITE OR PALE. 



readily be distinguished by the context, being white in cubensis and 

 olive in valenzuelianus. 



Trametes cubensis is a frequent species in American tropics, and 

 abundant specimens are at New York. 



SPECIMENS. Florida, C. G. L.; Brazil, Rev. Rick, Rev. Thiessen; Jamaica, Wm. Kirkland. 

 Compare albo-incarnata, comptulus, hemileucus, ostreatus. 



pilei. 



SECTION 83. VERY THIN WHITE PLANTS. 

 Excepting Polyporus floriformis, all are largely resupinate, with reflexed, thin 



Fig 654 



Fig. 655 (Pore 



Polyporus semisupinus. 



POLYPORUS SEMISUPINUS (Fig. 654) .Largely resupinate, 

 with a thin, reflexed pileus. Pileus pure white, thin, with smooth, dull 

 surface, no distinct crust. Flesh white, drying firm. Pores (Fig. 655) 

 very minute, round, white. Spores 1x5, allantoid, cylindrical, curved. 



This is not rare either in Europe or United States. It grows on 

 fallen branches and small stems of deciduous wood rather than on 

 logs. It is always largely, sometimes entirely, resupinate, and usually 

 has a rather thin, reflexed pileus. The color is white, drying slightly 

 yellowish. This plant was called by Bresadola (Fung. Kmet) Poly- 

 porus chioneus, and it seems to fit the original description. A quite 

 different plant (cfr. Polyporus albellus) is in Fries' herbarium, from 

 Karsten, under this name, and it surely is not Polyporus chioneus 

 "Fries in litt." at the British Museum. We have vacillated for years 

 as to what to call Polyporus chioneus, and finally concluded not to so 

 call anything. For a long while we so named specimens of this species. 

 The type of Polyporus semisupinus at Kew is scanty, but character- 

 istic, and it is not the plant Murrill has taken it to be. It was Poly- 

 porus nivosus (erroneously) for Morgan, and Peck named it Polyporus 

 semipileatus. 



SPECIMENS. We have about twenty collections from Europe and United States. Most of 

 them were determined as "Polyporus chioneus" when received. 



Compare caesiosimulans, semipileatus. 



316 



