TJic Genus Riccardia in Chile. 167 



differentiation into axis, photosynthetic branch-systems and stolons, 

 even if these various types intergrade ; in R. tenerrima no such 

 differentiation is apparent. R. antoica is further distinguished by 

 its smaller cells, averaging about 30 /* in width at least in the axis, 

 and by its large and complex male spikes, the openings into the 

 antheridial chambers being separated by three or four rows of 

 cells ; in R. tenerrima the cells are larger, the interior cells of the 

 axis averaging about 50 /w in width, and the openings into the 

 antheridial chambers of the much smaller male spikes are separated 

 by only one or two rows of cells. The female branches are 

 unusually short and lobe-like in both species, but the wings are 

 ciliate in R. autoica and barely crenulate in R. tenerrima. 



17. Riccardia diversiflora sp. nov. 



Growing in depressed mats, pale or yellowish green varying to 

 brownish : thallus apparently prostrate throughout, the axis 

 strongly flattened but scarcely winged and rather copiously 

 branched ; branches narrower than the axis and often more dis- 

 tinctly winged but otherwise scarcely differentiated, usually spar- 

 ingly subdivided, the secondary branches sometimes remaining 

 in a rudimentary condition; inflorescence heteroicous, the sexual 

 branches 5 , 9 or ^ : $ inflorescences borne singly, the wing 

 obliquely spreading, irregularly crenulate, two or three cells wide, 

 the antheridia mostly six to eight : ? inflorescence occupying 

 a short and simple branch ; involucre consisting of irregularly 

 toothed or ciliate wings and scattered teeth or cilia among the 

 archegonia ; ^ branches showing an abrupt transition from one 

 type of inflorescence to the other: remaining parts unknown. 



Specimens examined: in swamp, Gente Grande, Tierra del 

 Fuego. 1895, Diiscn 25 (U., cited by Stephani under Anenra 

 floribunda, 29, p. 8). Known only from the type locality. 



The present species is amply distinct from Anenra floribunda, 

 with which it has been confused. It is apparently closer to R.^ 

 autoica, although more robust, but even with this species the rela- 

 tionship is not very near. The plants are pale green or yellowish, 

 becoming pale or dark brown with age, and are loosely tufted in 

 admixture with other bryophytes. They are apparently prostrate 

 throughout or perhaps ascending at the tips, and the only rhizoids 

 observed have been situated on the sexual branches. 



The axis, as usual, shows long-continued growth and is com- 



