The plant is close to Hexagona tenuis as to color and general appearance, 

 with slightly deeper pores It came from Australia. Hexagona Muellcri also 

 from Australia, and based on a single specimen, is practically the same with 

 slightly more rugulose surface. Hexagona nigrocincta is for "me a pale form 

 of rigida, paler color and smoother than type of rigida. It came from New 

 Caledonia, and the ordinary form of rigida also occurs there. 



Fig. 310. 



Hexagona rigida. Type at Kew. 



HEXAGONA SIMILIS. The type specimen is of a very dark color with 

 agglutinate, fibrillose zoned surface, so that it has relations to the section Setosus. 

 None of the fibrils are free, however, and I think it is closer to rigida. The 

 pores are quite small and dark colored. The "type" is the only one in the cover 

 that has the agglutinate fibrils strongly marked. Others so referred seem to 

 me much closer to rigida. 



HEXAGONA ATROSANGUIXEA (Fig. 311). Plant growing 

 on under side of stick, and largely resnpinate with narrow, pileate 

 margin. Piletis thin, smooth, deep blood broi^n color. Pores small, 

 rngulose, shallow, many colored similar to ihc pilcus. and also with a 

 glaucous deposit. 



This species is very marked and the only one I have noted where the 

 pores are strongly colored red-brown. Its habit of growth is also different 

 from usual, and abundant specimens at Berlin all seem to have the same habits. 

 Whether it ever takes a truly pileate form I do not know, but I judge not, 

 as I think all the abundant types at Berlin are of the same nature. It came 

 from Africa and is only found in the museum at Berlin. 



HEXAGONA SACLEUXII (Fig. 312). Piletis rigid, with a 

 smooth, pale, strongly concentrically ridged surface. Pores vary in the 



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