DIPLOVHYLLUM. 239 



1. Diplophyllum albicans (Z.), Dim. 



Hepaticoides albescens foliis pinnatis,Ya,i\\. Bot. Par., p. lOO, t. 19, f. 5 (1723). 

 Jungermania repens foliis cordatis carinatis, Mich. Nov. pi. gen. p. 8, t. 15, f. 9 



(1729). 

 Lichenasiram auriculatum, pinnulis augustis planis recurvis, Dill. Hist. Muse, 



p. 492, t. 71, f. 20 (1741). 

 Jungermania albicans, Linn. Sp. pi. p. 1599 (1753), Hook. Brit. Jung. t. 25 



(181(5). 

 DiplojyhyUitm albicans, Dum. Recueil, p. 10 (1835). 



Dioicous ; growing in loose or matted tufts, medium size, of a 

 green, greenish-brown, or often reddish-brown colour, as if singed. 

 Stems simple or subramose, ascending ; radiculose, rootlets short, 

 close, dirty- white, ascending to apex of stem. Leaves bifarious, 

 contiguous, conduplicate, unequally divided to about the J, vittate, 

 margin entire or subdenticulate, often erose ; antical lobe half the 

 size of the postical, incumbent, 30°-40°, lanceolate, acute or 

 rounded ; postical lobe slightly ascending 60^-80^ lanceolate or 

 ovate-lanceolate, acute or rounded, cells subquadrate, small or 

 rather minute, cell-walls thick, no trigones. Bracts similar to 

 leaves, only larger. Perianth terminal, obovate, 5-plicate at the 

 upper portion, mouth contracted, laciniate-dentate, h^^aline. 



Perigonial bracts in the middle or at the end of the stem, 

 usually 4 to G pairs, often a little smaller, more erect; antheridia 

 1 or 2 in the swollen base of the antical lobe, oval, very large. 



Fruits March, April. 



Dimensions. — Stems from ^ inch to 2 inches long, diam. "2 mm. 

 to '5 mm. ; leaves, antical lobe 1* mm. x '5 mm., postical 1*75 mm. 

 X '75 mm., antical '6 mm. x "25 mm., postical '9 mm. x '4 mm. ; 

 cells '0175 mm., "02 mm. ; bract, antical lobe 1*25 mm. x '5 mm., 

 postical 1"7 mm. x '75 mm. ; perianth 2* mm. x 1' mm. ; perigonial 

 bract, antical lobe '7b mm. x "5 mm. ; postical lobe 1'24 mm. 

 X "5 mm. ; antheridia '3 mm. x "2 mm. 



Hab. — Grows everywhere, on rocks and banks in shady woods 

 or by roadsides, on the ground or walls; xery common, from the 

 lowlands to considerable heights. 1 to IS. I. C. 



Found on the Continent, Madeira, North and South America. 



