292 



ALLEN— SEX INHERITANCE IN SPH^ROCARPOS. 



spectively, drawn (living) a few days after their receipt from their 

 native habitat (Sanford, Florida), and therefore fairly typical of 

 the wild form. The female and male plants shown in Figs. 3 and 4 

 were taken from greenhouse cultures nearly three years old. The 

 most conspicuous differences result from the fact that the plants of 

 both sexes, and particularly their vegetative parts, grow more rap- 



Spharocarpos Donncllii. Living female (Fig. 3) and male (Fig. 4) 

 plants from greenhouse cultures. Rhizoids not shown in Fig. 4. Drawings 

 by Miss Martha Engel. X 7- 



idly and more luxuriantly under favorable conditions indoors ; the 

 branching is thus more noticeable, and the lateral lobes especially, 

 which in the wild plants are ordinarily insignificant, become, as pre- 

 vious observers have noted, decidedly leaf-like. The involucres 

 surrounding the sex organs become slenderer and often longer, the 

 archegonial involucres being characteristically tubular in the green- 

 house form. The orifices of the archegonial involucres are fre- 

 quently quite wide in plants grown in the greenhouse, though this 

 was not true of most of the involucres of the particular plant shown 

 in Fig. 3_. As a result of the greater development of the vegetative 

 parts and the lessened diameter of the involucres, the latter (in both 

 male and female) appear less crowded in the cultivated than in the 

 wild form. Similar modifications appear in cultures of 5. tcxanns, 

 as is shown by a comparison of Figs. 5 and 6 (wild form) with 

 Figs. 7 and 8 (greenhouse form). The plants shown in Figs. 5 



