BY E. A. BASTOW, F.L.S. 245 



For interesting observations on this plant and otlier 

 six new species, see Messrs. Carrington and Pearson's 

 communication in current proceedings of Roy. Soc. 

 Tasmania. 



It appears that the generic name Cesia has been 

 taken from " Musci Scandinavica " by Ca7T et Pear, but 

 as the Hookerian or Mittenian nomenclature prevails 

 in works treating of Tasmanian Hepaticce, Cesia erosa 

 is here placed as Gymnomitrium erosa. 



17. ISOTACHIS, Mitten. 



Leaves and Stipules nearly equal. 



Stem erect, branching with innovations almost trifarious. 

 Leaves almost trifarious, vertical, imbricating, conduplicate, 

 serrulate. Stipules nearly as large. Fruit terminal. In- 

 volucral leaves, inner minute, outer like the cauline. Peri- 

 anth erect, tubular, fleshy, rigid ; mouth contracted, 

 toothed. 



A Southern genus, of which its author says it may 

 be recognised by its evenly arranged leaves and 

 stipules, the latter so closely resembling leaves that 

 the leaves may be almost called trifarious. It resembles 

 Sendtnera in habit, but differs in the form of the 

 perianth and free calyptra. 



1. I. SUBTEIFIDA, Mitten, Fl. N.Z. p. 149. Jungerman^iia 



' subtrifida, Hook. f. and Tayl. Lond. Journ. Bot., 1844, p. 

 579. G. L, and K Syn. Hep. p. 681. Fl. Tasm. t. 

 179, f. 7. Stem lin. high, slender, simple ; tips 

 decurved. Leaves pale brown, upper rosy, loosely 

 imbricate, secund, erecto-patent, ovate, conduplicate, 

 2-3 fid. ; teeth and dorsal margin entire ; ventral entire 

 or toothed. Stipules similar, smaller. PI. xviii. 



Tufts rather loose, pale brown. Leaves loosely 

 imbricated below, more closely towards the thickened 

 summits of the stems, very tumid, the lower usually 

 bifid, the upper trifid, the segments short, lanceolate, 

 subapiculate. Lond. J. Bot., as above. 



Tasmania, Lawrence, (New Zealand.) 



2. I. GuNNiANA, Mitten. Brown, stems erect, proliferously 



branched, tufty, 1 or 2in. high. Leaves divaricate, 

 sub-vertical, cordate, deeply notched. Perianth cylin- 

 drical, fleshy, rough, apex white, diaphanous. PI. iii. 

 f. 3. PI. xviii. 



