96 JUNGERMANNIACEAE 
be given much weight. The leaves are sometimes slightly more 
decurrent than we have observed them to be in European forms. 
The wall of the perianth is often two cells thick at the angles but, 
we have never found the angles externally papillose-serrate. 
2. МАКРТА ОВОУАТА (Nees) Lindb. Bot. Notis. 1872: 167. 1872. 
· Jungermannia obovata Nees, Naturgesch. Eur. Leberm. 1: 332. 
1833. + 
Southbya obovata Lindb. Hartm. Skand. Fl. 2: 130. 1871. 
[ed. то.] 
Bright green to brownish-red, loosely caespitose : stems rather 
stout (.27—.64 mm. in diameter), 1-2 cm. long, prostrate or as- 
cending, simple or innovating above in fertile plants, very rarely 
otherwise branched ; root-hairs abundant, long and fasciculate, 
reddish-purple or occasionally decolorate: leaves rather firm in 
texture, distant or slightly overlapping, the lower obliquely at- 
tached (at an angle of about 45°), patent-horizontal, the upper 
more transversely inserted, divergent and subsquarrose or some- 
what erect, all orbicular-ovate from a narrowed, concave, sheath- 
ing base, plane, slightly concave or convex in the upper half, .9- 
17 mm х .7-1.5 mm, dorsally decurrent, entire or subrepand, 
the apex very obtusely or subtruncately rounded, rarely retuse; 
leaf-cells thin-walled, usually with small trigones, the sparse or 
moderately abundant chlorophyll-badies finally disposed near Ше 
vertical (lateral) walls, median and superior cells 32-60 /, the. 
marginal often subquadrate or a little elongated radially and form- 
ing an obscure border, cuticle delicately striatulate-papillate : 
underleaves none: paroicous : antheridia in pairs, short-stalked, 
accompanied by a few short paraphyses, borne in the saccate bases 
, , 
nearly hyaline cells, plicate toward the subentire or lobate mouth. 
On the banks of a shaded slough, Blue Lake, Humboldt Co., 
June 3, 1896 (1002). 
Nardia obovata has not before been recorded, we believe, for 
America, and as the above specimen is wholly sterile, its reference 
to this species is open to some question. With the exception 0 
the color of the root-hairs—which show only very rarely а ting? 
