1925] 



BURT THE THELEPHORACEAE OF NORTH AMERICA. XIV 355 



The thin, closely adnate fructifications of P. carnea, brownish 

 within and with a broad, dark, opaque zone next to the sub- 

 stratum, place this species in the P. cinerea group. It is remark- 

 able by having, in addition to the ordinary kind of cystidia, very 

 much larger cystidia which finally become, by the accretions of 

 mineral matter, very large masses of mineral nature with very 

 coarse grains on the exterior of the mass. In the Cuban gathering 

 which I have referred to this species, when a small portion of the 

 hymenial surface was moistened with alcohol and then with 

 water preparatory to removal of a bit of the fructification for 

 sectioning, the moist hymenium became punctate with minute 

 depressions, probably by presence at those points of the large 

 buried cystidia. This may prove a useful test for preliminary 

 sorting out, without examination by the microscope, of the rare 

 P. carnea from the more common P. cinerea of nearly similar 

 aspect. P. heterocystidia has cystidia of two kinds, like those of 

 P. carnea but thicker, readily separable from the substratum 

 when moistened, and with a narrow brown zone in the middle of 

 its sectional preparations and with a loosely interwoven hyaline 

 zone next to the substratum. The specimen in Kew Herbarium, 

 collected on fir in the Sierra Nevada Mountains, California, by 

 Harkness, 1025, and referred by Cooke to P. cinerea does not 

 have the large cystidia of his type and is P. cinerea instead. 



Specimens examined: 

 Texas: Galveston Bay, H. W. Ravenel, 78, type (in Kew Herb.). 

 Cuba: San Diego de los Banos, Pinar del Rio Province, Earle <fc 



Murrill, 333, comm. by N. Y. Bot. Gard. Herb. 



SPECIES TOO INCOMPLETELY DESCRIBED FOR LOCATION AMONG 



PRECEDING SPECIES 



Peniophora convolvens Bresadola, Ann. Myc. 18: 48. 1920. 



" Elongato-eff usa, ceraceo-membranacea, pallida vel avellanea, 

 ambitu similari, demum libero-convoluto; hymenio demum late 

 rimoso, interstitiis fibrillosis; sporis hyalinis, obovatis, 6-7 X 5- 

 6 {ji; basidiis clavatis, 40-45 X 6-7 y.; cystidiis saepe immersis 

 vel usque ad 45 [l prominentibus, 9-12 y. crassis. 



"Hab. ad ligna, St. Croix, Americae centralis. Raunkiaer." 



