4 HEPATICAE AND ANTHOCEROTES ОЕ CALIFORNIA 
incognita so far as its bryology is concerned. . The mountains of this. 
range in order to yield the best results should be explored during 
the spring months, while the snows are leaving and while the 
ground is still moist.. During the dry season, the terrestrial Hep- 
aticae become shriveled and more or less covered with dust, and 
are usually difficult to detect. Several species known to occur in 
British Columbia, Washington, and Oregon are likely to be found 
also in northern California, especially, perhaps, near the well- 
watered coast. The more arid portions of the state will doubt- 
less still yield *Riccias and quite possibly new hepatic forms with 
special provisions for withstanding a season of drought, such as are 
exhibited by Geothallus tuberosus and Anthoceros phymatodes. Ad- 
ditions to the state list are to be expected from any quarter, but 
more particularly, we think, from the regions indicated. 
On the following pages is a table designed to give some idea 
of the geographical range of the Hepaticae and Anthocerotes of 
California, taking into consideration only the hepaticologically bet- 
ter known portions of the Northern Hemisphere, the facts of 
distribution being compiled from the most recent and trustworthy 
sources. It will be seen that of our 86 species (representing 36 
genera), 37 (43+%) occur also in the Gray's Manual Region (2. e., 
the northern, eastern, and central United States, extending beyond 
the Mississippi River to the 1ooth meridian and southward to 
North Carolina and Tennessee); 40 (4614 +%) in the British Isles ; 
46 (534 — №) in northern and central Europe ; 46 (5314 —%) in 
the Mediterranean Region of Europe ; and 36 (42 — %) in northern 
Asia (including Siberia, China, and Japan); 37 (43 + fb) are pecu- 
liar to Pacific Slope of America, several of them having not yet 
been found outside of California. It is of some interest to remark 
that the number of species peculiar to the Pacific Slope is propor- 
tionally greater than of those peculiar to the Gray’s Manual Re- 
gion, even though we may not stop to prove this by figures. The 
difference between 43% and 53 14% is sufficient to justify the asser- 
tion that the hepatic flora of California has more in common with 
Europe than with the eastern and central United States. But facts 
involving the consideration of species do not always lend them- 
selves with grace and accuracy to mathematical modes of expression. 
The European species Porella laevigata, Riccia ciliata,and Anthoceros 
