212 Rhodora [NOVEMBER 
of gemmae L. Muelleri can be distinguished from L. heterocolpa by the 
sharper lobes of the leaves, by the slightly larger leaf-cells, and by the 
smaller trigones. In most other respects the two species are very 
much alike and have often been confused. 
4. Lopuozia optusa (Lindb.) Evans, Proc. Wash. Acad. 2: 303. 
1899. Jungermannia obtusa Lindb. Musc. Scand. 7. 1879. On a 
shaded bank, mixed with mosses. Round Mountain, Franklin 
County, Maine (Miss Lorenz, 1912). 'The third North American 
station for the species, the other two being at much higher latitudes, 
in Alaska and Ellesmere Land, respectively. The plant is widely 
distributed in Europe but is nowhere abundant. It has not yet been 
reported from Asia. Since L. obtusa is figured and fully described in 
the recent manuals of K. Müller and Macvicar, only its most striking 
peculiarities need be mentioned here. The plants rarely grow in 
pure mats but usually straggle through tufts of other bryophytes. 
They vary in color from yellowish to dark green and bear a superficial 
resemblance, as Müller has pointed out, to the much commoner L. 
barbata (Schmid.) Dumort. The leaves, however, will at once separate 
the species. Instead of being four-lobed, as is usual in L. barbata, 
they are almost invariably only two-lobed, and the lobes are further 
characterized by being rounded or very obtuse at the apex. In most 
cases the postical lobe is a little larger than the antical, and there 
is a tendency on slender stems for the lobes to be somewhat sharper 
than is normal. Fortunately robust stems with the lobes in typical 
condition are usually present. The underleaves are very rudimentary 
and cannot easily be demonstrated. "This peculiarity, the absence of 
specialized gemmiparous shoots, and the larger size will at once dis- 
tinguish L. obtusa from L. heterocolpa, in which also the lobes are 
normally blunt. In spite of its bilobed leaves L. obtusa apparently 
belongs in the subgenus Barbilophozia and is placed there both by 
Müller and by Macvicar. The Maine specimens of L. obtusa and of 
L. heterocolpa were determined by Miss Lorenz, who has kindly sup- 
plied the writer with illustrative material. 
5. CnmiLoscyPHUS ASCENDENS (Hook. & Wils.) Sulliv.; Gray's 
Manual, Ed. I. 691. 1848. Jungermannia ascendens Hook. & Wils.; 
Drummond, Musc. Amer. St. Merid. 165. 1841. The original 
material of this supposed species was collected by Drummond at St. 
Louis, Missouri, and distributed, as indicated above, in his second 
series of exsiccatae. Soon afterwards Sullivant detected it at Colum- 
