Holloway. — Prothallus, &c, of Tmesipteris. 



389 



Fig. 1. — A very young complete prothallus in general view. X 110. 

 Fig. 2. — Basal end of a young prothallus in general view, showing the spore. X 270. 

 Fig. 3. — Basal end of the prothallus shown in fig. 4. X 110. 



Fig. 4. — Medium-aged prothallus in general view, showing twofold forking of the 

 head, and also the distribution of the fungus, x 35. 



