APPENDIX. 



HEP ATIC^E. Juss. DE CAND. 

 (Part of Alaas, Linn. Calyptratce, Deoperculatce, Mohr.) 



Fructification generally of two kinds ; 1st, Capsules, in an early 

 stage, covered with a calyptra, which is tipped with an apparent 

 style, often surrounded by a perianth or calyx, at length bursting the 

 calyptra irregularly, and rising on a peduncle, and opening at 

 the extremity with two or four or many valves, destitute of 

 operculum, bearing within numerous seeds, mixed (except in 

 Riccia, and perhaps Sphcerocarpus,) with spiral filaments ; 2dly, 

 oblong or mostly rounded, and frequently shortly pedunculated, 

 reticulated bodies, Anthers? containing a very minutely granu- 

 lated substance which escapes by an aperture formed at the ex- 

 tremity. 



Minute plants frequently frondose, sometimes, in Jungerman- 

 nia for instance, leaf-bearing ; the leaves often divided, never 

 really nerved. From various parts of the fronds or leaves, 

 gemmce are produced in many instances. Their substance is 

 loosely cellular in general, easily reviving, after being dried, by 

 the application of moisture. Sometimes the areolse of the cells 

 have an evident pore, as in Marchantia and Targionia, and then 

 the plants, after being once dried, are found to revive very slowly. 



I. RICCIA. 



Capsule sphaerical, immersed in the frond, indehiscent, crowned 

 with a style, which is alone protruded. 

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