shaped and incised. They are detersive and fall away from old specimens. 8 

 Our figure (277) shows the same species (of Australia) in three different con- 

 ditions. But there are species that we include in this section in which these 

 hairs are not so strongly developed. Hexagona Deschampsii (Fig. 282) has 

 the hairs or fibrils strongly agglutinate with only a few free fibrils. It resembles 

 old, worn conditions of the previous species. And finally we include in this 

 section species strongly marked with entirely agglutinate fibrils as Hexagona 

 elegans (Fig. 284). 



Velutinus. This section includes species with fine, soft, velutinate hairs 

 (Fig. 289). It embraces but a few species. 



Glaber. Surface smooth, but often zoned or uneven, but not hirsute, 

 velutinate or with strongly agglutinate fibrils. 



General shape. There are of course intermediate specimens, but 

 most species can be arranged in one of three sections according to 

 their general shape. All Hexagonas are sessile without stems, 4 or 

 (as in albida) sometimes a rudimentary-lateral stem. 



Ungulaformis. This section, which comprises but a very few species, has 

 the pileus thick with deep pores. It is usually hard and sub-woody and cor- 

 responds to the genus Fomes, though the pores are never stratified. 



Applanatus. The texture is softer and general shape is flatter than in the 

 previous section. The shape corresponds to the usual shape of Fomes ap- 

 planatus. Usually it is a centimeter or more thick. We include in this section 

 also some species such as Kurzii that are thinner and tend toward the next 

 section but have deeper pores, 5 mm. or more. 



Tenuis. The character of the section tenuis is the very thin pileus, rarely 

 over two or three mm. thick, and the small (for Hexagona) shallow, regular 

 pores. 



The setae in the pores. There are some species of Hexagona that 

 have conspicuous, colored setae in the pores. Sometimes these setae 

 are large enough to be seen with the naked eye, and can easily be 



noted on the accom- 

 panying figure (278), 

 which is enlarged six 

 diameters. These 

 setae are always in 

 connection with fer- 

 ruginous or cinnamon 

 context. They are 

 much larger than the 

 microscopic setae 

 found on many poly- 

 poroids. (Cfr. Pol. 

 Issue, page 2), and 

 often called cystidia. 

 Klotzsch noticed 

 F.o.278 xe. these setae and pro- 



posed a new tribe, 

 Scenidium, but the idea never found favor. The inner surface of the 



3 Mr. Murrill states that the plants are "nearly glabrous when young" and are finally 

 clothed with these hairs. I think his explanation should be taken backwards. 



* This statement excludes Hexagona gracilis, which, however, is not a Hexagona for me. 



