EVANS : HEPATIC/E COLLECTED IN SOUTHERN PATAGONIA. 45 



As a matter of fact, the underleaves are deeply 2-parted, and the description 

 quoted above applies to the divisions and not to the complete structures. 

 Angstrom also omits mention of the cuticle of the leaves, which is 

 strongly verrucose, and is one of the most striking peculiarities of the 

 plant. 



19. JUNGERMANNIA HATCHERi Evans, Torrey Bulletin, 25: 417. 1898. 



PL V, Figs. 1-7. 



Jungermannia barbata, B. floerkii Gottsche, Die Lebermoose Siid-Geor- 



giens, 450. //. 6. 1890. Non Jungermannia floerkii Web. & Mohr. 



Sterile : plants loosely caespitose or creeping over tufts of Lophocolea 

 rigens, yellowish-brown ; stems simple or sparingly branched, densely 

 radiculose; leaves closely imbricated, obliquely inserted, more or less 

 crispate, broadly quadrate ; abruptly widening from the base, not decurrent, 

 cleft one third or more into 4 obtuse, acute or cuspidate lobes, separated 

 by obtuse or lunulate sinuses, postical margin bearing near the base a 

 cluster of 2-5 fine hair-like cilia, each consisting of 2-8 cells, usually in a 

 single row ; underleaves divided almost to the base into 2 slender divi- 

 sions, bearing cilia in the lower part ; leaf-cells rather thin-walled with dis- 

 tinct trigones, cuticle smooth or nearly so ; gemmae reddish-brown, borne 

 in chains and forming clusters on the teeth of the upper leaves, angular, 

 composed of i or 2 cells. 



Stems .5-1 cm. long, 0.35 mm. in diameter; leaves 1.55 mm. long, 1.20 

 mm. wide; underleaves 0.55 mm. long, 0.15 mm. wide; leaf-cells on mar- 

 gin 15 fi, in the middle 19 JJL, and at the base 23 JJL in diameter; gemmae 

 15 fL in diameter. 



Lapataia. 



The present species is an antarctic representative of the Aottfafe-group 

 of the genus Jnngermannia, a group of closely allied plants, which forms 

 a most conspicuous feature of the hepatic floras of northern and arctic 

 regions. The presence of basal cilia on the leaves shows an approach to 

 J. lycopodioides and J. floerkii, and to the latter species the Patagonian 

 plant bears a marked resemblance. The principal points of difference 

 have already been indicated by Gottsche. In J. floerkii, the leaves do 

 not broaden out so abruptly from the base as in J. hatcheri, their lateral 

 margins are more nearly parallel and their more robust basal cilia are 

 often 2 or 3 cells wide in the lower part ; the underleaves are much larger 



