116 BOTANICAL GAZETTE | avGust 
mitrium (a, fig. 4). Campbell’? also states that it does not 
occur in Targionia nor in /2mbriaria Californica. The remainder 
of the development does not differ materially from that of: 
typical archegonium of any of the Marchantiacea, and it need 
not be repeated here. 
: 
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: 
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Fic. 4.—Archegonia. a, 4, c, d, ¢, f, longitudinal sections of nce ae 
*, apical cell; /, /, 7, cover cell; v, ventral canal cell; g, transverse section ° 
an archegonium about the age of e. a, b,c, X 600; d,e, X 480; 4% x e 
The cover cell, which in other forms studied” divides ? 
four cells immediately after the neck has been separated 
the venter, remains undivided for a considerably longer tims 
this species (4, c, d, /, fig. 4). Unfortunately I was " : 
determine just when this division took place. Several arch $ 
were obtained at the age of the one represented in d, fig. # 
CAMPBELL : of. cit. 52. 1895. 
“CAMPBELL : of. cit. 30. 1895. 
