478 Murrill: Polyporaceae of North America 



corky ; hymenium concolorous, rigid, tubes thin-walled, mouths 

 circular to irregular ; spores smooth, hyaline. 



The species of this genus will be considered in a later paper. 



n. Rigidoporus gen. nov. 



Type : Polyporus micromegas Mont. 



Hymenophore annual, at times reviving, epixylous, sessile, 

 dimidiate, conchate, simple or imbricate ; surface pelliculose, mul- 

 tizonate, margin thin, incurved when dry ; context thin, white, 

 woody, very rigid when dry, tubes minute, regular, light-brown, 

 mouths pruinose when young ; spores smooth, hyaline. 



Rigidoporus micromegas (Mont.) 



Polyporus micromegas Mont. PI. Cell. Cuba 423. 1842. 

 Polyporus plumbeus Lev. Ann. Sci. Nat. III. Bot. 5: 136. 1846. 

 Polystictus rufopictus Cooke, Grevillea 15: 23. 1886. 



Besides the above names, assigned to Cuba and Guadeloupe 

 specimens, there are several manuscript names and doubtless oth- 

 ers in publication which refer to the same species. 



This plant has been generally known under the name of P. 

 zonalis Berk., described from Konig's Ceylon collections (Ann. 

 Mag. Nat. Hist. 10: Suppl. 375. pi. 10. f. 5. 1843). It: is ex " 

 ceedingly common in tropical America and in the states border- 

 ing the Gulf of Mexico, occurring usually during wet weather on 

 water-soaked logs of various species of palms and other broad- 

 leaved trees. It is very rigid when dry and the pores are almost 

 invisible. Some of the more recent collections are here men- 

 tioned. 



Cuba, Earlc, Underwood, Murrill ; Jamaica, Earlc, Underwood; 

 Porto Rico, Earle, Wilson ; Florida, Ruhr ; Louisiana, Langlois ; 

 Alabama, Underwood, Earlc. 



12. Earliella gen. nov. 



Type : Earliella cubcusis sp. nov. 



Hymenophore medium to large, annual, epixylous, semi-re - 

 supinate, thin and dry but rigid ; surface pelliculose, glabrous, 

 zonate, more or less reddish-brown in color ; context white, cori- 

 aceous, zonatc ; hymenium flesh-colored, tubes medium, irregular, 

 becoming thin-walled ; spores smooth, hyaline. 



