HANDBOOK OK I'.RmSH HEPATICil-:. 271 



male receptacles stalked, often with lour 

 indistinct angles, marked on the top with a 

 cruciate crest; frond obcordate, innovant 

 from the sinus. 



Marcliantia commutata, Linden. Hep. Eur. 

 lOi. MarcJiaiitia hemisphccrka, Hook. Br. 

 Fl. \., 104. Marcliantia androgyna, Eng. Bot. 

 t. 2545. Prcissia commiitata, Nees Hep. Eur. 

 p. 117; Cooke Hep. f. i88 ; Carr. and Pears. 

 Exs. 208, 209. 



Side of mountain streams. 



Fronds procumbent, imbricated, oblong, i to 3 

 inches, generally forked, rarely simple, waved and 

 crenate at the margin, dark green above, frequently 

 with a dark central line indi- 

 cating the midrib, underside often Y^ 

 purple at the margin, midrib promi- ^W 

 nent, with numerous silky radicles, 

 beset on each side with purple scales. 

 ]\Ionoicous or dioicous. Male recep- 

 taclewithshort pedicels springing from | S^^^ 



the midrib in a sinus at the end of ' ^' <i 

 the frond, receptacle peltate, flat and fv^ <f^ 

 papillose above, purplish, margins re- f C^ 

 flexed, cut into four or eight rounded \ j 

 lobes. Female receptacle with pedicels f f 

 2 to 4 inches long, hemispherical, cut \ I 

 at the margin into from four to ten or 

 eleven obtusedeflexed lobes, coveringas ^^9- 

 many involucres, which have entire margins. Calyx 

 white, quadrifid, two to three in each involucre. 

 Capsule scarcely protruded when mature on a 



