122 J. TRI AN A ET J.-E. PJLAIVCUOIM (C. M. CiOTTSCUE). 



Cui defiriitioni adjicitur : « The perianth like that of J. Lyallii and 

 » J. madida is remarkably thick and fleshy ; in the last named species it 

 » is composed of five strata of cells ; the roughness on its exterior surface 

 » appears to be caused by the partial breaking up of the external wall of 

 » cells and resembles that of the calyptrae of the Sarcomitria. » 



Siclarissimum Mitten sequi placet ad hoc genus porro referendae sunt : 



Isotachis uncinata (J. uncinata Web., Synops. Hep., p. 126, n. 99. — 

 SteriUs), 



Isotachis conduplicata (J. conduplicata Ldbg., Synops. Hep,, p. 680. 



— SteriUs), 



Isotachis hœmatodes (J. hsematodes L. L., Synops. Hep., p. 129, 

 n. 101. — Cum perianth.), 



Isotachis multiceps (J. raulticeps Lg. Q., Synops. Hep., p. 687, n. 137 b. 



— Cum perianth.). 



Observare volumus, quod involucri folia accessoria vel « intima 3 mi- 

 nutissima involucralia » Mittenii etiamin Jungermannia erythrorhiza L. L. 

 et in Jungermannia vexante G. mss. e Venezuela, quse huic proxima est, 

 inveniuntur, in quarum utraque capsula valvulis tortihbus notabilis est. 



Earum plantarum, quas cl. Mitten ipse inter Isotachides suas enume- 

 ratj scilicet /. madidce, serrulatœ, armatœ, prseterea J. hœmatodis et 

 multicipitis perfectas fructilicationes vidi et accuratissima dissectione 

 examinavi, ad quas etiam duse novae species Novo-Granatenses adjicere 

 licet, ita ut observationes meœ quodammodo fundamentum securum 

 habeant. 



In omnibus hisce plantis apex perianthii statu normah foliolis accesso- 

 riis vel involucralibus minoribus purpurascentibus obvelatus est nec 

 videri potest, nisi margo apicis (perianthii longitudinaliter discissi) ah 

 interna facie perlustratur, quee res clarissimum Mittenium in /. madida 

 et serrulata saltem effugit. Qua ex re diagnosis Jungermanniœ serru- 

 latœ Sw., Synops. Hep., p. 127, n. 98, in calcepro : « ore contracto den- 

 ticulato dealbatOy » mutanda est in : *.c ore contracto dent iculato, squamulis 

 involucralibus dealbatis dentatis externe accretis obvelato. » (Cf. Gottsclie 

 et Rabenhorst, Hep. Europ., exsiccat.\ Adnotat. ad n. 272. ) 



In flore multa3 squamulae involucrales torum pistillorum adhuc nudum 

 circumstant, quae post perianthii formationem et incrementum eodem 

 in calycem attolluntur modo, ac pistilla sterilia in calyptram. Quarum 

 extimœ sisLunt illa « 3 folia et amphigastrium involucralia interna minu- 

 tissima » Mittenii, quse facile pr^etervidentur et perianthio tantummodo 

 appressa dicuntur, quamquam rêvera ei accreta sunt; squamulse intimae 

 altius in perianthium attolluntur et ex parle apicem perianthii ob vêlant, 



