Conklin—Preliminary Report on a Collection of Hepaticae. 1007 
70. Porella platyphylla (L.) Lindb. 
No. 841 Knife River, Minn., Aug. 1, 1909. 
No. 922 Albert, Minn., Aug., 1905. 
No. 325 Lester Park, Duluth, Minn. 
No. 1023 Solon Springs, Wis., May, 1807. 
No. 324 Superior, Wis. 
No. 1196 Lutsen, Cook Co v Minn., Sept., 1911. 
71. Gololejeunea Biddlecomiae (Aust.) Evans. 
No. 549 Copper Creek, Douglas Co., Wis. 
No. 384 Copper Creek, Douglas Co., Wis. 
No. 1055 Black River, Douglas Co., Wis., Oct. 3, 1910. 
Carlton, Minn., Sept. 26, 1907, rocks. 
72. Lejeunea cavifolia (Ehrh.) Lindb. 
No. 674 Carlton, Minn., Sept. 26, 1909, rocks. 
No. 547 Knife River, Minn., Xug. 1, 1909, rocks. 
No. 1163 Lutsen, Cook Co., Minn., Sept., 1911. 
Radula complanata is common on rocks and humus cliffs 
and will sustain quite a full exposure to the sun. It grows on 
trees, cedar, balsam, tamarack, and birch. 
R. obconica has been found only on trees in dense wooded 
swamps at the higher altitudes. 
Porella platyhylla grows on rocks in shade, or mossy hanks, 
at the base of trees in dense woods. 
Porella pinnata grows only on rocks just above the high water 
line. Associated hepatics are, Frullania inflata and R. com¬ 
planata. 
Coloejeunea Biddlecomiae, is one of the smallest species in 
the District and grows on bare rocks and loose stones preferring 
a damp almost dark recess or cave or pile of stones deeply 
shaded by the overhanging bank. In these places it spread a 
thin film of grey green over large surfaces. The plants are al¬ 
most impossible to remove from the substratum. Once 
only was it found growing on humus ground. It was at the 
base of a densely wooded cliff at Copper Creek, with a trout 
pool and rapid at its base, that the patch of pale green showed 
itself, surrounded by flowering plants of Moneses grandiflora 
On© has only to add to the scene the murmuring of the wind 
through the pine tops, the splashes of brilliant sunshine and 
