120 J. TREAI^A ET J.-E. PLAW€S§0:\i (c. M. CîOTTSCiïE). 



inconstantia, quee etiam in nonnuilis stirpibus décolores inveiiiuntur, a 

 conditionibus normalibus typi originalis recedit. A foliis involucralibus 

 cum perianthio altius concretis diagnosin desumpsi, sed forsan haec forma 

 species sui juris inter Jungermanniam hyalinam et obovatam quasi inter- 

 jecta est, quod observationibus futuris dijudicandum erit.j 



IIÎ. — ISOTACHIS Mitten (reformat.). 



Perianthiam terminale crassius (e â-7 cellularum stratis com- 

 positum) cylindrico-conicum, apice plerumque dealbato dentato 

 squamulis dentatis piirpurascentibus vel decoloribus obvelatum. 

 IiiYolucri folia (ad speciem) intima minutissima 3 quasi abortiva 

 perianthio adulto disperse accreta eique arcte adpressa. Calyptra 

 inclusa libéra, membranacea, pistillis abortivis basi et altius 

 stipata. Capsula oblonga, firma ad basin usque quadrivalvis, 

 valvulis autrectis aut tortilibus dehiscens, interne fibris semicir- 

 cularibiis depicta. Elateres Yalvuiis ubique insidentes, caduci, 

 bispiri. Semina fusca, leevia. Inflorescentia mascula in planta 

 diversa; perigoniorum spica vel in apice vel in medio ramo foliis 

 majoribus composita, vel amentacea in ramis microphyllis, in 

 axillis unicum antheridium continentibus. CaulesQVQÇ^Ïi^ arrhizi; 

 folia conduplicata cuticula tam laxe vestita ut cellulae singulœ 

 rugulos88 (^) appareant; amphigastria magna foliis subcon- 

 formia. Plantœ médiocres aut grandiusculae , saepe rosese vel 

 purpuresB, in caespitibus densis crescentes. 



^^Jungermamnamadida^ serrulata^uncinata et congeneribus cl. Mitten 

 novum genus, Isotachidem suam, condidit, quod in Flora Novse Zelan- 

 diae, p. 1^9, hisce verbis defmivit : 



« Perianthium terminale, tubulosum, ore contracte dentato. Gaulis 

 *) erectus, innovationibus ramosus. Folia incuba, amphigastria fere con- 

 » formia, conduplicata, saepe serrulata. » 



Quibus adjecit : « The above appears to be ail that may be safely affir- 

 » med of this genus. It is readily recognized by its evenly arranged leaves 

 « and stipules, which last so nearly resemble the leaves in size and form, 

 » that the foliage might almost be called trifarious. The perfect capsule 

 )) bas been seen only in two species, in one of which it is spirally twisted, 

 » and in the otber perfectly even and straight. This Genus is distinguished 



