525 
especially true of British Columbia specimens (Macoun : Cascades, 
Yale, May, 1875; no. 63, near Victoria, May 30, 1893), and of 
our no. 1068, from California. These latter differ, however, from 
P. laevigata in the smaller, narrower, more pointed, and more 
strongly calcarate ventral lobes, and in the usually more slender 
fronds. They are forms like these, we take it, that have been re- 
ferred by Mr. Pearson * to P. /aevigata, but in the predominating 
forms in Washington, Oregon and California the plant is much less 
suggestive of P. /aevigata, and we prefer to maintain Stephani’s 
species, and to associate with it the British Columbia specimens 
alluded to and our no, 1068, even though, as must be admitted, 
they make a near approach to certain conditions of the European 
plant. Perianths occur only on our no. 994 from Blue Lake, 
Humboldt Co., California. We have been unable to compare the’ 
perianths of Porella laevigata, inasmuch as these organs are uni- 
formly’ wanting in the somewhat extended series of European 
specimens that we have been privileged to examine, but the perianth 
of P. laevigata is described by Nees + as ovate, inflated, and trun- 
cate-bi-trilobed, while in P. Roe/lii the perianth is broadly obovate 
or goblet-shaped, and scarcely lobed at the wide truncate mouth. - 
No. 150, Hep. Am. (issued as Porella Roellii, var.) belongs 
with P. rivularis, as is evidenced by the form of the ventral lobes 
and underleaves, the short 9 branches, the characters of the peri- 
anth, etc. 
Professor Macoun’s specimen from Yale, British Columbia, 
May, 1875, was labeled “ Madotheca Macounii n. sp.” and ‘ M7. 
_ laevigata, var. integrifolia,”’ by Austin in herd. . 
8. PorELLa BoLaNnpERI (Aust.) Pearson, List. Can. Hep. 7. 1890. 
[excluding specimens cited (?)] 
Madotheca Bolanderi Aust. Bull. Torr. Bot. Club, 3: 14. 1872. 
_ Dark- or yellowish-green, dull: stems 114-6 cm. long, sub- 
simple or with a few somewhat fasciculately disposed obtuse tumid 
branches, often subpendulous, more or less vaulted or flexuous 
when dry : dorsal lobes of leaves densely imbricate, appressed or 
subsquarrose, dimidiate-ovate to oblong, 1.5-2.9 mm.x.67-1.8 
mm., sometimes considerably narrowed toward the obtuse apex, 
arava Wiss 
* List of Canadian Hepaticae, 7, 1890. 
: t Naturgesch. Eur. Leberm, 3 : 165. 1838. 
