110 ACOTYLEDONS. IIEPATICJE. 



covered with a calypira, tipped with a style (?), and then 

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

 calyptra irregularly, and rising on a peduncle (except in Ric- 

 cia), and opening at the extremity into 2 or 4 equal valves, 

 destitute of operculum, bearing within numerous seeds mixed 

 with spiral Jilaments : and oblong or mostly rounded, and 

 frequently shortly pedunculated, reticulated bodies, anthers (.?), 

 containing a very minuteJy granulated substance which escapes 

 by an aperture formed at the extremity. Minute plants fre- 

 quently frondose, sometimes (as in Jungermannia) , foliife- 

 ferous ; the leaves often divided, never really nerved. Sub- 

 stance loosely cellular in general, easily reviving, after being 

 dried, by moisture. Sometimes the areola* of the cells have au 

 evident pore, as in Marchantia and Targionia. 



1. RICCIA. 



Capsule sphaerical, immersed in the frond (not opening ?), 

 crowned with the style which is alone protruded. I am but 

 imperfectly acquainted with \\\e fructification of the plants at- 

 tributed to this genus. In R. glauca I can discover no ca- 

 lyptra, and were it not that its herbaceous texture assimilates 

 it with the Hepaticce, it would be hard to distinguish it from 

 the genus Endocarpon among the Lichens. Only one kind of 

 fruct'ification has ever been discovered ; upon some of the 

 British species indeed, R. 7ialans m\djluita?is 9 none. 



1. R. glauca, frond small oblong somewhat divided, the seg- 

 ments two-lobed at the extremity fleshy glaucous dotted on 

 the surface and slightly channelled with the fructifications near 

 the base. Ligktf. p. 709. E. B. t. 2546. 



1 1 AB. Rocks slightly covered with earth at the Tarbet of Can tire, &c,, 



Light/. 

 Frequently growing in a radiating or stellated manner in patches of 



half an inch long. 



2. R. spuria, " fronds membranaceous lobed pellucid, fructifica- 

 tions beneath the sinuses of the lobes solitary exserted turbi- 

 nate toothed." Dicks. Plant. Crypt, fasc. 4. p. 20. /. 11. 



/. 16. 



HAB. Turfy marshes among the Scotch mountains, Dickson. 



Of this plant I know nothing but from Dickson's figure and descrip- 

 tion above quoted. It seems very ill to accord with Riccia. 



2. ANTHOCEROS. 



Capsule pedunculated, linear, two-valved, with a central colu- 



mella, to which the seeds are attached. 

 1. A. multijidus, fronds bipinnatifid linear. Dicks. PL Crypt. 



fasc. 3. p. 13. Dill. Muse. t. 68. /. 4. 



