PLAGIOCHASMA. 333 



sence does not always depend upon the growth of the radi- 

 cles from the whole of the inferior surface of the frond. 



The terminal ones are inflexed over to the proliferous apex 

 of the frond. They are more or less inclined to be red : they 

 obviously represent the leaves, so called of some Junger- 

 mannias, and also the ramenta of Ferns ? 



The anthers I have not seen : but from other instances 

 I imagine that the membrane is excessively fine, and either 

 adheres to the inside of its loculus, or disappears ; it obvious- 

 ly cannot escape by the elongated papilla communication with 

 the cell. This papilla perhaps opens by circumcissiun : they 

 are obviously hollow, but appear closed up during their ear- 

 lier stages by a grumous mass. 



Such instances as this and March antia, are fatal to the idea 

 of the anthers growing, their dehiscense is most apparent, they 

 cannot escape from their cells, while the whole phenomena 

 are consonant with what we know of impregnation. The ex- 

 sertion of the stigma, the papillose canal for allowing the 

 contents of the anther to escape, and these two effects exist- 

 ing simultaneously, are proofs in favour of the idea of their 

 sexuality. 



The apex of the style appears in this species really stigma- 

 tic, that is, its canal is terminated by a mucus looking-rounded 

 mass the sphacelation is subsequently manifest, and in this 

 as well as in all other similar cases, the stigma appears disor- 

 ganised, with minute granules adhering to its irregular mar- 

 gin. 



Of Cuticulate Marchantiaceae there are three principal types 

 known to me ; of these one, Marchantia has the inflorescence 

 supported on a stalk which is a continuation of the whole 

 frond, is hence terminal and the head has also the frondose 

 structure ; the opposite to this is furnished by the present 

 species and some others, in which the stalk is cellular, not 

 terminal, and a prolongation upwards of the under layer. 



The third ? is in Targionia, in which the inflorescence is 

 sessile at the apex of the frond, this form is intermediate, be- 

 cause the inflorescence has not the frondose structure. 



