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Evans: REPORT ON THE HEPATICAE OF ALASKA 599 
On soilin very damp woods. Augustine Bay (684, Foster 2475); 
Port San Antonio (652). New to America. Heretofore known 
only from the mountains of the Hawaiian Islands, where it was 
collected many years ago by Tolmie and more recently by Baldwin. 
It may perhaps appear hazardous to refer an Alaskan plant to a 
species of the Hawaiian Islands, but a careful comparison of the 
specimens noted above with material collected by Baldwin on the 
island of Maui has failed to bring to light any essential differences. 
It should be admitted, however, that L. sandvicensis is known from 
the Hawaiian Islands in sterile condition only and that the Alaskan 
material is equally destitute of female inflorescences. It is 
possible, therefore, that the discovery of perichaetial bracts and 
perianths may bring to light differential characters necessitating 
the segregation of the American plant as a distinct species. - 
The description and figures of Lindenberg give a clear general 
idea of the species, while a number of additional details are supplied 
by Cooke. L. sandvicensis belongs to a fairly well-defined group 
of Lepidoziae which are mostly of tropical distribution. They 
are characterized by pinnate stems with subdivided branches, the 
stems being limited in growth and blunt, the branches being 
likewise limited in growth but tapering out into slender flagella, 
The branches are of about the same length and give the entire 
shoot system a loosely plumose appearance. The group is further 
characterized by very minute leaves and underleaves, which are 
mostly far apart. Most of the photosynthesis is therefore carried 
out by the green axes, and the plants, in some cases at least, look 
almost as if they belonged to the thallose genus Riccardia. 
In L. sandvicensis the main stem is somewhat flattened dorso- 
ventrally, measuring about 0.5 X0.3 mm. in section, and is bounded 
by a layer of short cells arranged in from forty to sixty longitudinal 
rows. These cells have thickened walls and measure about 20 yu 
in width. The internal cells average about 15 u in width and have 
somewhat thinner walls. Rhizoids are wanting except near the 
tips of some of the flagelliform branches. The leaves and under- 
leaves are so well described by Cooke that only a few of their more 
important features need be noted here. The stem leaves are 
almost transversely attached and extend obliquely outward, 
scarcely, if at all, projecting beyond the stem. The antical edge 
