18 



ARKIV FÖR BOTANIK. BAND 1. 



B).^ In both species the globose spores are 0,045 — 0,055 mm 

 in diameter, fig. 6. 



The shape of the lobes and their venation is more varied,, 

 and Tr. sociale constitutes a more compound form than Tr. 

 hymenoides; the lobes are very often quite linear and more 

 large than broad, giving room for more numerous ultimate 

 veinlets in a lobe, than in any form of Jr. hymenoides. Each 

 lobe has a long, llexnose, regularly pinnate midrib with 

 alternatin o- veinlets. 



Fig. fj. A Trichoma )ies hymenoides Hedw., edt^e of the involucral lip of a 

 specimen in Herb. Swartz (X 90): B tlie same from South Brazil. Rio Grande 

 do Sul, Exped. 1. Regnell. n. A. 397 iX 90): C Trich. sociale Fee. edge of 

 the involncral li]). specimen from Rio de .Janeiro, Glaziou n. 5242 (X 90): 



S spores (X 90). 



There may be a greater diflPerence, if the rhizome, as is 

 the case with our specimens, is more slender and less shaggy 

 than in Tr. hymenoides, but this can only be decided hy 

 farther observations of a great number of living specimens. 



Hab. Brazil, Rio de Janeiro; Glaziou 5242. 



' In a specimen from Herb. Swartz, fig. G, A, Tr. hymenoides has the 

 two lips of the involucre reddish brown: in a South Brazilian one, fig. 6, B,. 

 the lip is bordered with a whitish edge. These diiferences probably depend 

 on a vounger or older state of the involucre. 



