1925] 



BURT — THE THELEPHORACEAE OF NORTH AMERICA. XIV 347 



6-7 [i. in diameter, often colored for 20 ;jl at the base and there 

 with the aspect of buried setae; basidia deteriorated; no spores 

 found. 



Fructifications 4-8 cm. long, 1-1 H cni. broad. 



On bark and decorticated wood of decaying Fraxinus. Louisi- 

 ana. January. Probably rare. 



This species has the color and aspect of P. nuda and P. caesia 

 but differs from both of these and also from P. cinerea in having 

 its opaque basal layer 120 [x thick, comprising the whole thickness 

 of the fructification except the hymenium, and in having its 

 hyphae thick-walled and distinct and colored as in Hymeno- 

 chaete. The cystidia differ from those of the species just named 

 and also P. pruinata in not being incrusted and are noteworthy 

 by being attacked and partially dissolved by 7 per cent solution 

 of potassium hydrate to such a degree that they are best studied 

 when sections are mounted in lactic acid. 



Specimens examined: 

 Louisiana: St. Martin ville, A. B. Langlois, 1758, type (in N. Y. 



Bot. Gard. Herb., and Mo. Bot. Gard. Herb., 63416). 



117. P. violaceo-livida (Sommf.) Bresadola in Bourdot & 

 Galzin, Soc. Myc. Fr. Bui. 28: 405. 1913; Rea, Brit. Basid. 695. 

 1922. 



Thelephora violaceo-livida Sommerfelt, Fl. Lapp. Suppl. 283. 

 1826. — Corticium violaceo-lividum (Sommf.) Fries, Epicr. 564. 

 1838; Hym. Eur. 655. 1874; Sacc. Syll. Fung. 6: 627. 1888. 



Fructifications somewhat effused, closely adnate, rather thick, 

 tubercular, pale mouse-gray to drab-gray, often round ; in section 

 brownish, 100-300 [x thick, becoming zonate within, darker and 

 opaque next to the substratum, the hyphae somewhat colored, 

 densely arranged, erect; cystidia incrusted, 20-30 X 6-9 (x, dis- 

 tributed in all regions, very numerous; spores hyaline, even, 

 curved, 6-9 X 23/2-4 \x, as found with sections. 



Fructifications 1-4 X 3^-2 cm., often with the component 

 masses rounded, 5-7 mm. in diameter. 



On fallen limbs of Salix, Prunus, Fraxinus Castanea, and 

 Quercus. Canada to Louisiana. March to October. Rare. 



The concept of this species presented by Bresadola, which has 



