Stipe none Microporus-Apus. (The section Microporus might 

 be confined to stipitate species, and a new section made for 

 the sessile species. As it has exactly the same texture, 

 color, and pores, and a piece of the pileus of one can not be 

 told from a piece of the pileus of the other, I think they 

 should be classed together.) Pileus smooth. Pores white. . . .pterygodes 



Geographical Distribution. The home of these plants is Africa, where they 

 grow in the greatest abundance, but they occur over the East Indies, India, 

 Ceylon, Philippines, Australia, and the Pacific Islands. Generally speaking 

 both the mesopodal and the pleuropodal species occur over this vast territory, 

 but the African collections run to mesopodal species and those of the Pacific 

 Islands to pleuropodal species. 1 In tropical America they are very rare. But 

 two species I think are known from tropical America, viz. : porphyritrs and 

 pterygodes, and but very few collections of these. 2 In our consideration of 



Fig. 336 



Polystictus xanthopus. 



the species we shall only give the prominent key characters. We deem it useless 

 to repeat under each the characters common to all, as many of the "descrip- 

 tions" are drawn up. 



POLYSTICTUS XANTHOPUS (Fig. 336). Stipe yellow, 

 smooth, varying in length from a cm. to five cm. or more, usually 

 central, often eccentric, but not lateral. Pileus smooth, even. 



] In Samoa, where flabelliformis is very abundant, I have never seen a specimen of a 

 mesopodal form. 



2 In Fries' herbarium is a typical specimen of Polystictus xanthopus ascribed to Mexico, 

 but I think the locality is due to some error in labeling. 



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