122 



Forty-second Annual Report on the 



Trunks of birches, alders and maple, Acer spicatum. Sandlake, 

 Catskill and Adirondack mountains. Aug. and Sept. 



Related to P. radiatus, and like it belonging to the genus Polystictus 

 of modern classification. It is distinguished by its paler color, often 

 lineate-zonate pileus aid paler spores. 



Polyporus variiformis, n. sp. 



Pileus 4 to 10 lines broad, coriaceous or subcorky, nearly plane, 

 somewhat strigose-tomentose, tawny-rufescent, subzonate, often nodu- 

 lose, sometimes wholly resupinate, substance white; pores rather 

 large, subrotund, angular or even flexuous, white, in oblique situations 

 gaping or lacerated. 



Var. nodulosus. Piiei very small, narrowly reflexed, forming small 

 nodules. 



Var. resupinatus. Wholly resupinate or with a narrowly reflexed 

 continuous margin. 



Var. interruptus. Interruptedly resupinate or anastomosingly creep- 

 ing, marginless. 



Prostrate trunks of spruce, Picea nigra. Adirondack mountains, 

 North Elba and Cascadeville. June and Sept. 



This species is very variable and seems ambiguous between Poly- 

 stictus, Dsedalea and Trametes. It appears to live through the winter 

 and revive again the next season. It is almost corky in texture. 

 The pores are at first pure white, but they become whitish or pallid 

 with age. 



Polyporus rhodellus, Ft. 



Prostrate trunks of hemlock, Abies Canadensis. Adirondack moun- 

 tains. Aug. 



This and the two following species belong to the genus Poria of 

 Persoon. 



Polyporus marginellus, n. sp. 



Resupinate, effused, forming extensive patches, 1 to 3 lines thick ; 

 subiculum distinct, firm, subcinnamon, the extreme growing margin 

 white, becoming dark-ferruginous with age; pores at first short, sunk 

 in the tomentum of the subiculum, then longer, minute, rotund, often 

 oblique, brownish-ferruginous, glaucous within, the dissepiments 

 thick, obtuse. 



Dead bark and decorticated trunks of spruce, Abies nigra. North 

 Elba. Sept. 



Remarkable for and very distinct by the narrow downy white mar- 

 gin that borders the growing plant. 



