IV. 



THE ANTHOCEROTES 



147 



The archegonium of Dendroceros is much hke that of the 

 other genera, perhaps more nearly approaching that of Antho- 

 ceros. 



The embryo of Dendroceros resembles more nearly that of 

 Anthoceros than it does Notothylas. The archesporium is less 



a. 



D. 



b 



FiC. yZ.— Dendroceros Breutelii. A, Thallus with sporophyte attached, X4; "B, apex 

 of the thallus X600; C, archegonium, X600; D, E, young antheridia, X600. 



developed than in either species of Anthoceros that were studied 

 by the writer, showing only an imperfect division into two lay- 

 ers when seen in section. No stomata are developed in the epi- 



