Handbook of British hepaticæ : containing descriptions and figures of the indigenous species of Marchantia, Jungermannia, Riccia and Anthoceros / by M.C. Cooke.

Cooke, M. C. (Mordecai Cubitt), 1825-1914.

Date:: 1894

Credit: Handbook of British hepaticæ : containing descriptions and figures of the indigenous species of Marchantia, Jungermannia, Riccia and Anthoceros / by M.C. Cooke. Source: Wellcome Collection.

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$either inflated or partially inrolled or cucullate— sometimes even bell-shaped or cylindrical—is almost unknown in Jungermanniece. Several genera possess a character entirely unknown among Jitbu- Icce, viz., a perianth that is wide-mouthed through- out its existence, and therefore needs not to be rup- tured for the emission of the capsule. The calyptra, as compared with the perianth, is of various lengths, being in some species scarcely at all shorter, but in others four times as short. The character of an in- ferior or half inferior calyptra, occurring in several genera of Jungermanniece, is quite unknown in Ju- Inilac. Elaters numerous—sometimes to be counted by thousands, produced on the whole inner surface of the capsule, usually slender and tortuous, nar- rower at each end (never truncate), and each in- cludes two spiral fibres—rarely three or more—very rarely only one. When the capsule bursts they mostly fall out all together along with the spores. Spores very numerous and usually very minute, in only a few genera equalling these of the Jubulea; nearly always globose. The Jungermanniece are further sub-divided into eight sub-tribes, of which seven have the elaters normally bispiral. That is to say—the Radulece, I \ vr//ra\ PtilidiecB, Trigonanthece, Scapanioidece^ Epigonianthece and Fossombroniece. The eighth,Mete- .v<<\ has the elaters monospiral, and at the same time the species are frondose. The relations of these several tribes to each other will be found under each, as hereafter follows :— -b$