Development of Sporangia upon Fern Prothalti. 57 



turn, Desv., in which sporangia were borne upon the prothallus, has 

 already been described in a preliminary statement.* It is therefore 

 sufficient to express the results of prolonged cultivation of these and 

 the remaining species in a tabular form. 



Table of the Results of cultivating Prothalli for a Period of Two 

 Yea,rs and a Half. 



[Note. In every species normal embryos were produced when 

 conditions permitted fertilisation.] 



Name. 



Scolopendrium vulgare. Sin., var. 

 ram u losisa imuin. 



var. marginale. 



Nephrodium dilatatum, Desv., var. 

 cristatum gracile. 



Nephrodium Oreopteris,Desv.^ var. 

 coronans. 



Result. 



Garaetophytic budding. 

 Development of archegonial projections. 

 Development of cylindrical process usually 

 from the apical region of the prothallus. 



C Tracheides in cylindrical process. 

 Leaves, roots, and ramenta on 



process. 

 Apogauiy. \ Sporangia on the process. 



Vegetative buds from tip of 

 cylindrical process, or ir. place 

 L of an archegonial projection. 



Similar to var. ramulosissimum, but no spor- 

 angia, isolated ramenta, or leaves found. 



Gametophytic budding. 

 Development of archegonial projections. 

 Development of cylindrical process, usually 

 from the under surface just behind the 

 apex, which formed a " middle lobe." 



TTracheides in middle lobe and 



cylindrical process. 



. J Sporangia, sometimes associated 



* ' j with ramenta, on middle lobe 



and process. 

 l^JNo vegetative buds. 



Gametophytic budding. 

 Development of archegonial projections. 

 Development of cylindrical process from apex 

 of prothallus. 



/-Tracheides in cylindrical pro- 



] Ramenta on cylindrical process. 

 L Vegetative buds (rare). 



1 Boy. Soc. Proc,,' vol. 60, p. 250. 



VOL. LX1II. 



