﻿414 Evans : Hepaticae of Southern Patagonia 



the others but only 2-parted (though often apparently 4-parted 

 from the large size of the external basal teeth of the segments) : 

 leaf-cells oblong, rather thick-walled but without trigones ; cuticle 

 often indistinctly and minutely verruculose-striate, especially toward 

 the base of the leaves. 



Stems 1-2 cm. long, 0.2 mm. wide ; leaves 0.85 mm. long and 



wide, leaf-cells averaging 46 a long, 14// wide. [Plate 345' % s< 

 1-6.] 



Villarina Bay. 



The leaves of the present species are so copiously and finely 

 dissected that the plant reminds one at first glance of a Trichocolea, 

 but the scanty branching, the dark color and the occasional rhiz- 

 oids would seem to remove it from that g-enus. The somewhat 



problematical T. polyacantha (Hook. f. & Tayl.) from New Zea- 

 land might, nevertheless, seem from the published descriptions 

 and figures* to be identical with our species, but a study oi the 

 type material in the Taylor Herbarium shows conclusively that 

 this curious plant is distinct not only from Blepliarostoma pilosuni 

 but also from B. qiiadripartititm (Hook.) Trevis., of which 

 Schiffnerf has considered it a possible synonym. The New Zea- 

 land species is distinguished at once by the numerous para- 

 phylla which clothe the stem and give it a hirsute appearance ; 

 they are minute structures, composed of only 2-4 cells and are 

 either simple or forked, their cells, like those of the leaves, being 

 minutely verruculose. Whether the plant is really a Tricliocolca or 

 not can hardly be settled without a larger supply of material, as 

 the true nature of the involucre cannot be made out without dis- 



section. 



f 



In the remarks which supplement Mr. Pearson's description o 

 Btcpharostoma palmatum Iindb.,1 a statement is made which 

 would seem to indicate that B. pilosuiu (or some closely allied plant) 

 has sometimes been included under B. quadripartituvu The speci- 

 mens listed below agree closely with authentic specimens of this 

 latter species in the Taylor Herbarium and also with a drawing 

 in the Sullivant collection made from material collected on t 

 Wilkes Expedition. The main differences between the two are t ie 

 following : B. quadripartitum is smaller than B. pilosum, andj_ 



*Lond. Jour. Bot. 3 : 290. 1844. Fl. Ant. 1 : lbl.pl. 6j. f- 9- l844 

 I Lebernioose der Forschungsreise S. M. S. " Gazelle,'" 19. 1890. 



t Jour. Bot. 25 : 193-195. pi. *?S- 1887. 



