50 THE POLYPORACEAE OF WISCONSIN. 



Poria violacea Fries. 



Effused, determinate, usually orbicular, thin, smooth and glabrate, 

 adnate, without much subiculum; violet; pores short, cellular, as if 

 formed by upraised veins, entire. 



"Allied to Merulius, for which a young specimen might be taken.''* 



Vein* thin, closely adnate; pores small, irregular, shallow, soft. 

 Color varying from violet to violet purple. When young the violet, 

 moist mycelium which is sometimes almost gelatinous, covers the sub- 

 stratum very closely and the pores seem to be formed by upfoldings as 

 in Merulius, to which it is said to be related. The young specimens 

 may indeed be mistaken for resupinate forms of Merulius tremellosus, 

 the color and structure being much the same. Mature specimens may 

 be confounded with resupinate forms of Polystictus abietinus. From 

 Merulius this species may be separated by the smaller pores with acute 

 dissepiments and the innate thin pileus. Polyporus abietinus has 

 longer, more torn pores and a firmer body. (It is also closely related to 

 Poria purpurea, but this is usually darker in color and has a white floc- 

 culose border. 



Our specimens were collected near Palmyra on very rotten wood. 

 The specimens are not large — being about 8 — 9 cm. long ; 2 — £ cm. 

 wide ; diameter of pores varying from .3 to 2 mm. The mature speci- 

 mens have a reddish-violet color and the younger ones turned a darker 

 purple-violet on drying. 



Syn: Polyporus violaceus Fries 28, I, p. 412. 



Poria purpurea Fries. 



Broadly and irregularly effused, the white flocculuse mycelium 

 creeping over the surface of the rotten wood and producing here and 

 there groups of minute, unequal, purple-lilac pores about one line 

 deep. 



Morgan (18, VIII, p. 106) says that it occurs on the bark of sugar 

 maple: that it is thin and delicate, occurring in straggling patches, 

 with groups of purple pores on the white mycelium. Some of the 

 dried specimens bleach out white. He also says that this species is 

 the same as Polyporus lilacinus Schw. 



This is more broadly and irregularly effused than the preceding 

 species. It is very thin, closely innate, with a more or less white- 

 flocculose border, the white mycelium creeping over the rotten wood 

 producing here and there groups of minute unequal purple-lilac pores. 

 The color is decidedly darker than the preceding species: the pores 



