HYGROBIELLA.
With root-hairs; underleaves undivided. PLEUROCLADA.
Leaves rounded, entire or nearly so. ODONTOSCHISMA.
Leaves incubous ; plants larger, often conspicuous (except in Lepidozia).
Leaves rounded, entire or minutely two-toothed ; perianth wanting, the sporo phyte rising from a buried pouch. KANTIA.
Leaves narrowed toward the end, usually 3-toothed. BAZZANIA.
Leaves palmately 3-4-cleft or divided. LEPIDOZIA.
Of the above genera, Hygrobiella is represented by three north European species one of which 11.1axifolia (Hook.) Spruce has recently been sent in from Idaho collected by Sandberg ; it is also found in Greenland ; P/curodada, a monotypic genus of boreal regions, has been found by Macoun in the Rocky Mts. of British America ; Odontoschisma has three American species as known at present ; Kantur is represented by four American species, one of them, K. a:pita (N. & M.) Lindb., introduced in greenhouses ;* Bas'annia, so abundantly represented in tropical and south Tem perate regions, has with us the two northern species that are like wise common in Europe; and Lepia'oz,ia, likewise a large genus of universal distribution, has with us only three species.t The remaining genus, Cephalonia, is the largest and the most widely distributed genus of the tribe on our continent. The Euro pean species were somewhat increased in number by the researches of Lindberg in Scandanavia, and the greater part of the tangled synonomy, to which Lindberg also contributed, was worked out by Spruce in 1882, athough he added to the tangle by knowingly giving to one species the same name that Lindberg had already given (unwittingly) to another species ! The latest curiosity in the nomenclature of the genus is that expressed by Schiffner,t who, after establishing all of Spruce's subgenera as genera, rejected the old generic name, Cephalonia, which has been in use for over a half century, and adopted the subgeneric name Eucephalozia, first used by Spruce in 1882 to designate the typical members of the genus, as a generic name! Cephalonia was proposed as a section of Jungennania by Du mortier in 1811 and was erected into a distinct genus by the same author in 1835 with Iiingermania byssacea Roth. as a type species.
It was not accepted by the authors of the Synopsis Hepaticarum 1844-7, but the same is true of many other early genera not pro posed by Nees, one of the authors of the work. It was after wards accepted by Gottsche, and later hepaticologists have ac cepted it without question, Schiffner alone excepted, as above stated. Of its sub-genera, as noted below, Noweilia differs most widely in its general facies from the rest of the genus, but none of the groups seem sufficiently separate for generic distinction. The genus as here recognized can be characterized as follows: