Jungermannia.] HEPATIC2E. 107 



1. Fuliaceous. 



A. Stems without Stipules* 



a. Leaves inserted on all sides of the stem.f 



1. J. Hookeri, Sm. (Hookerian Jungermannia); stem erect some- 

 what branched, leaves imbricated on all sides ovate or oblongo- 

 ovate here and there lobed or angled, fruit terminal, perianth 

 none, calyptra large oblong fleshy smooth. E. Bot. t. 4. Hook. 

 Br. Jung. t. 54. Lindenb. St/n. Hepat. p. 96. — Gymnomitriou 

 Hooheri, Corda, in Sturm Dcutschl. Fl. cum Ic. 



Very rare. Boggy places at Cadnam, New Forest, Hants ; and Kin- 

 nordy Moss, C. LyeU, Es</. Fr. Spring. — This very remarkable spe- 

 cies which differs in habit from all other Jungermannue, has been most un- 

 naturally combined with J. coneinnata and distinguished as the Genus 

 Gymnomitrion by Corda; and still more unnaturally with J. Mackaii, 

 serpyUifolia, &c. to form the genus Lejcunia (of Libert.) by Sprengel, 



The nature of this work does not give me the opportunity of discuss- 

 ing the necessity of separating the Jungermannia into other Genera, as 

 has been done by Eaddi and Corda and others. Their observations 

 will tend to a much better knowledge of the species; but it requires a 

 more extended acquaintance with exotic species than we yet pos- 

 sess, to form Genera upon solid grounds. Lindenberg, in his Synopsis 

 Hepaticarum Europaarum, has, with great judgment, preserved the 

 Genus in question, entire; and his work is a model of accurate descrip- 

 tion and profound research. 



b. Leaves bifarious. 



* Leaves undivided. 



2. J. asplenioides, Linn. (JSpleenwort Jungermannia); stems 

 ascending branched, leaves obovato-rotundate ciliato-dentate 

 somewhat recurved, fruit terminal and lateral, perianth oblong 

 compressed oblique, the mouth truncated subciliated. Linn. Sp. 

 PL p. 1597. Hook. Brit. Jung. t. \'). E. Bot.t. L788. Hobs. Br. 

 Mosses, v I. n. 111. Lindenb. Syn. II<j><it. j>. 72. — DiU. Muse. 



t. 69./ .">, (;. 



Moisl had} hank, and among rocks; frequent. Fr. Apr.— 



This is one of the largesl of our Bpecies; from 3 to ■> or even <; inches 

 in length. 



:). J. spinuldsa, Dicks, (prickly-leaved Jungermanni |; stem 



erect branched, leave- ovale recurved with the margin ami the 

 apex on one side dentatO-Spinulose, fruit lateral and axillary. 



perianth roundish compressed, the mouth truncate ciliated. 



. Cr. Fasc. 2. />. II. Hook. Br. Jung. t. 14. E. 

 t. 2228. Hobs. Br. u.2.n. 111. Lindenb. 8yn. Hepat. 



* In this division will l»- found ./. Sphagni and ./ tempn—a, which lie. 

 ■tipulei onlj up. n their you us shoots 



r ./. fricAoj ,/,„//,:. ceo, laxifolia, and turn*/ n found 



to have bifarioua leaves .111.1 itipules, sre removed t<> the division b 



