1042 HEPATICiE COLLECTED BY MR. T. WHITELEGGE IN N. S. WALES, 



We feel pleasure therefore in publishing an exhaustive review 

 of the question by Dr. Gottsche contained in a letter to Dr. 

 Carrington, dated Altona, 29 Dec. 1862, Jan. 1863. 



" IsoTACHis, Mitten. 



" Charact. gen. •' Perianthium terminale, tubulosum, ore contracto 

 dentato. Caulis erectus innovationibus ramosus. Folia incuba, 

 amphigastriaque fere conformia, conduplicata, saepe serrulata.' 

 Flor. Nov. Zeeland, p. 149. 



" The above appear to be all that may be safely affirmed of this 

 genus. It is readily recognised 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 has been seen only in two species, in one of which it is 

 spirally twistsd and in the other perfectly even and straight. This 

 genus is distinguished from Jimgermannia by its incubous leaves, 

 and from Sendtnera, which it closely resembles in habit, by the 

 form of its perianth and free calyptra. 



" ISOTACHIS LYALLII. 



" It is closely allied to /. madida and to /. Gunniana in the 

 structure of the perianth, which unlike any other Jungermanjiia, 

 is composed of several layers of cells ; this thickening of its wall 

 is not owing to the adhering of the calyptra within, nor to leaves 

 on the external surface. The inner involucral leaves in all these 

 species are very minute and liable to be overlooked. 



" IsoTACHis Gunniana. 



" The perianth like that of /. Lyallii and madida is remark- 

 ably 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 uj) of the external wall of cells, 

 and resembles that of the calyptra of Sarcomitria." Mitt. op. cit, 



" Mitten names : I, suhtrifida, madida, Lyallii, Gunniana, intor- 

 tifolia, indica, serrulata, and armata, ' Isotachis.' 



