CRYPTOGAMIA ALG^. 793 



FEM. Calyx leffilis, campanulatus, polyfpcTrr.us. 



polymorpha MARCHANTIA calyce communi decemfido. 

 '* Sp. pi. 1603. ( Mich fi. gen. t. i./, i. Bilkn.mtijc. 



/, 76./. 6.) . 



Great ftar-headed Marchantia, y^nglis. 



pn fliady moift rocks, on the banks of rivulets, 

 and the fides of wells, and fometimes in bogs. 

 V-VII. 



The leaves are about three inches long, from 

 half an inch to an inch wide, lying flat upon 

 the ground, and adhering clofcly to ir by nu- 

 merous downy radicles, which grow out of the 

 middle and bafe of the leaf, on the under fide. 

 Thefe leaves are varioufly divided into obtufe 

 lobes, finuated on the edges ; their upper fur- 

 fape of a dark, fhining^ green colour, reticu- 

 lated with ni^mcrous minute rhomboidal, or lo- 

 '^enge-like fcales, and divided in the middle by 

 a black purple vein ; their under fide is of a 

 paler green, and their fubilancc coriaceous and 

 nearly opake. 



The frudifications are of three kinds. The fir Ji 

 are flat, circular umbels, a quarter of an inch 

 in diameter, arifing generally out of the finufcs 

 of the leaves, at firft feflile, but akerwards 

 elevated on firm pedicles, from half an inch to 

 an inch high j at firfl: whitifli, but afterwards 

 turning to a dark brown or blackilh colour. 

 Thefe umbels are at firft entire on the edc^es* 

 but afterwards .divided into feven, cight,^or 



nine. 



