32 Murrill: Polyporaceae of North America 



l8. Stipe ivory-black below, pileus usually ochraceous, surface scarcely depressed, mar- 

 gin even, not becoming extremely thin. 22. P. elegans. 

 Stipe smoky-black below, pileus usually chestnut-colored, depressed at the center 

 or behind, margin very thin and irregular. 23. P. fissiis. 



1. PoLYPORUS HYDNiCEPS B. & C. Jour. Linii. Soc. Bot. lo : 



305. 1868 

 This is one of Wright's plants collected in Cuba. Berkeley's 

 description is characteristically brief, but, fortunately, the type 

 still exists in fairly good condition in the Kew herbarium. It is 

 readily distinguished from all other species in the genus by the 

 short cylindrical or subpyramidal hydnoid processes which it 

 bears on the surface of the pileus near the margin. In shape it 

 is variable and quite irregular, often breaking into fan-shaped lobes 

 as it develops and folding inward or outward at the margin as 

 circumstances determine. The stipe is short, thick, usually 

 blackish and often reticulate. The fruit bodies occur at times in 

 clusters with their stipes closely united at the base. In general 

 appearance this species resembles Sciitiger grisens and its near 

 allies, but it seems hardly fleshy enough for that group and is 

 moreover so much like species of Polyporns in habit that I have 

 retained it in the latter genus as here restricted. 



2. PoLYPORUS scABRiCEPS B. & C. Jour. Linn. Soc. Bot. lo : 



305. 1868 

 This species is well named. The type at Kew, collected by 

 Wright in Cuba on decaying wood, is well preserved and still 

 shows the characteristic scabrous covering. Other characters are 

 the dark brown surface, involute margin, decurrent, dentate tubes 

 and short brown stipe. Like most of the Cuban species, it is rare 

 and very imperfectly known as regards distribution and variation. 



3. PoLYPORUS viRGATUS B. & C. Jour. Linn. Soc. Bot. lo : 



304. 1868 

 Six type plants of this species are at Kew, collected in Cuba 

 by Wright. They are of the typical Polyporus form and habit 

 with rather delicate, fragile tubes and thin cuticle, which at length 

 ruptures in a way quite characteristic of the species. This plant 

 resembles P. discoideus, but is tougher, firmer and somewhat 

 smaller in addition to being virgate. 



