Murrill: Polyporaceae of North America 473 



4. PIPTOPORUS Karst. Rev. Myc. 3 9 : 17. 188 1 



Type : Boletus betulinus Bull. 



Hymenophore annual, epixylous, umbonate-sessile ; surface 

 smooth, azonate, pelliculose ; context white, fleshy-tough ; hyme- 

 nium at length separating smoothly from the context, tubes white, 

 thick-walled ; spores smooth, cylindrical, hyaline. 



Species : P. suberosus (L.) Murr. [See Bull. Torrey Club 30 : 

 424, 425. 1903.] 



5. Dendrophagus gen. nov. 



Type : Polyporus Colossus Fr. 



Hymenophore very large, but of light weight, annual, epixy- 

 lous, sessile, dimidiate', thick and pulvinate ; surface pelliculose, 

 glabrous, azonate, margin very obtuse ; context very thick, soft 

 and spongy throughout ; tubes small, dark-colored, thin-walled, 

 fragile ; spores smooth, hyaline. 



Dendrophagus Colossus (Fr.) 

 Polyporus Colossus Fr. Nov.-Symb. 56. 185 1. 



Described from material collected by Oersted on stumps of 

 Cedrela odorata at Puntarena in Costa Rica as follows : 



"Pileo floccoso-suberoso molli crasso pulvinato, margine 

 tumido obiusissimo, primitus cuticula tenella laevi vernicea sul- 

 furea tecto, eaque secedente scabroso, contextu stuppeo mollissimo 

 alutaceo-pallescente, poris minutis elongatis mollibus, intus fusce- 



scentibus." 



" Portentum mirabile et magnitudine et ponderis levitate. 

 Fungus dimidiatus, sessilis, reniformis sed undulatus, crassimus 

 (3-4 unc.) etiam in margine obtusissimo, contextu stuppeo-fomen- 

 tario (nullo modo fibroso ut in Spongiosis), mollissima, alutaceo- 

 pallida 1. isabellina. Pileus extus quoque mollissimus, ut digito 

 pressus foveas relinquat persistentes, undulatus, more P. betulini 

 tectus cuticula laevi vernicea arete adnata citrina, et in hoc statu 

 pileus politus apparet, at cuticula secedente scabrosus evadit et de- 

 colorans. Pori valde longi et densi, absque trama discolori et a 

 pileo separabiles, ore minuto, exsiccati nigrescentes, intus fusces- 

 centes ; in vivo enim admodum molles et hinc in exsiccatis con- 

 fluunt in callum nigricantem absque poris extus conspicuis. Ad 

 truncos ins. San Jan Indiae occid. lectus est fungus aeque gigan- 

 teus, textura eadem, modo obscurior et pondere gravior ; sed pileus 

 epeliiculosus, scabrosus, nigrescens. Pro forma prions exoleta 

 habeo." 



