( cxxxiii ) 



In the Central Asian genus Metaporia I have so far failed 

 to find plume-scales of any description. 



In the genus Ganoris we have G. rapae, G. napi, and the 

 allied forms, with scent-scales similar to one another though 

 specifically distinct. G. brassicae, with its geographical races, 

 stands somewhat apart from the rest in this as in other par- 

 ticulars. The lamina of G. brassicae is very long, cordate with 

 distinct cornua, the sides tapering gradually towards the nar- 

 row dist.al extremity, which is squared, not pointed, and 

 furnished with fimbriae which are long, filiform and irregularly 

 disposed, forming a sort of tangle. The plumule in G. 

 ivollastoni is scarcely to be distinguished from the preceding, 

 but that of G. cheiranthi tends to be somewhat longer, and also 

 thicker towards the apex. 



The plume-scale of Ganoris rapae is well known. Its lamina 

 is strongly cordate, with the distal portion elongated. The 

 basal cornua are strongly marked, and the apex is sharp. The 

 chitinous sculpturing is elaborate, consisting of longitudinal 

 bars with frequent lateral connections. The bars, which 

 follow roughly the contour of the lamina, converge towards 

 the apex, forming an irregularly granular area at about a 

 third of the distance from the apex to the base. The portion 

 distal to the granular area is almost clear, but marked with 

 fine longitudinal and parallel lines, probably corresponding to 

 the fimbi-iae. The disc is moderate in size and nearly circular. 

 The scent-scale in G. canidia much resembles this, but the 

 narrowing of the lamina towai-ds the apex is more abrupt, the 

 sides of the distal portion being parallel. The cornua ai-e 

 more pronounced than in G. rapae. The scent-scale of G. napi 

 resembles the last, but the lamina is somewhat larger, and has 

 the cordate form still more distinctly marked, the sides of the 

 proximal portion showing a strong convexity. The cornua are 

 broad, blunt and very pronounced ; they are genei'ally turned 

 inwards towards the middle line. The axes of the distal and 

 proximal parts of the lamina are in these three species usually 

 inclined to one another at an angle. The scales, both ordinary 

 and special, of Ganoris canidia and G. napi suggest those of 

 some forms of Finacopteryx. The ordinary scales of Ganoris 

 brassicae are very different from any of these, being very long, 



