﻿i30 Evans : Hepaticae of Southern Patagonia 



with 



branched, sometimes giving off radiculose stolons from the lower 

 part; stem-leaves distant and rudimentary below, more or less 

 imbricated and larger above, obliquely inserted, somewhat con- 

 cave, obovate-orbicular from a narrowed base, antical margin de- 

 current, straight or slightly curved, entire, postical margin reaching 

 nearly to middle of stem, slightly or not at all decurrent, entire, 

 sinuate, or with a few scattered teeth, apex broad and variable, 

 sometimes distinctly emarginate-bilobed, with acute, obtuse or 

 rounded lobes, sometimes truncate, entire or sparingly and irregu- 

 larly dentate with blunt teeth; underleaves wanting; leaf-cells 

 thin-walled with small but distinct trigones, somewhat elongated 

 toward base, cuticle smooth : o inflorescence terminal on short 

 ascending stems or elongated branches ; bracts crowded, similar 

 to the leaves, but even more irregular in shape, sometimes un- 

 equally 2-lobed, the innermost narrower and more delicate than 

 the others and sometimes more conspicuously toothed, sac taper- 

 ing to a blunt point, radiculose : <? inflorescence borne in the course 

 of ascending stems, bracts in about five pairs, imbricated, strongly 

 saccate below, but with spreading apices above, broadly orbicular 

 when explanate, truncate or emarginate -bifid, the postical lobe being 



the larger. 



Stems 1.5-3 



leaves 



long, 1.85 mm. broad ; leaf-cells at base 58 fx long, 29// broad, in 

 other parts of the leaf 29 /x in diameter ; outer perichaetial bracts 1.9 

 mm. long and broad, sac 2.7 mm. long, 1 mm. in diameter; pen- 

 gonial bracts 1 mm. long, 1.45 mm. wide. The foregoing measure- 

 ments may be considered representative of this very variable species. 



Lapotaia. 



In its pale color and in the shape and areolation of its leaves, 

 the present plant strongly resembles Marsupidiwn Urvtil****^ 

 which is a more robust species with its leaves more strongly den- 

 tate and inflexed on their antical margins. As far as can be judged 

 from descriptions, the two species differ from each other in the po- 

 sition of the ? inflorescence and pendant sac, necessitating their 

 separation into distinct genera. In Marsnpidmm UrviiUamtm, this 

 sac is described by Mitten* as " attached to the lower part of t* 

 stem by its side ;" in the closely related (if not identical) #■ 

 Brccknockknsc (Massal.) Besch. and Massal., its authort say s • 

 " perichaetia ad ramorum basim et in ramulo brevissimo sublateran 



* Handb. N. Zeal, ^JS^T^i^. ~~~~~ 



fNuovoGior. Bot. Ital. 17: 214. 1885. 



