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specimens of Mile. Vickers he had seen, did not think that she 

 was warranted in naming the algae Gr. glohifera^). 



The West Indian specimens seem to agree very well with those 

 from the shores of the United States. It may be that the vegetative 

 cells in my plants were somewhat thicker than in the specimens 

 from the United States I have seen, but I do not think we can 

 lay so very much stress upon this fact and Professor F a r I o w also 

 kindly informs me that the shape and size of the North American 

 plant vary very much, especially in the tetrasporic and sterile 

 specimens, and as my plant on the other hand, in its tetraspores, 

 antheridia and cystocarps, seems to agree completely with the 

 description of the plant from the United States I have referred it 

 without any doubt to this species. 



As to the life-history of this plant we have in recent times 

 got a thorough description by Lewis (I.e.) to which I here refer, 

 only giving a few figures with a short description of each to show 

 the identity of my plant. 



Quite in accordance with what Lewis has pointed out, in 

 my material also by far the most part of the specimens collected 

 were tetraspoj'ic. 



The tetraspores form a ring at the upper end of the cell at 

 the internode (Fig. 20, A, B). They are surrounded by a circle of 

 short, somewhat inward curved involucral rays. The tetrasporangia 

 are found commonly three together (Fig. 20 C) one of which is 

 terminally the others laterally placed on a basal cell; the develop- 

 ment of this tetrasporic branch is given in detail by Lewis. 



Fig. 20 E shows the mature procarp with the four-celled car- 

 pogonic branch; it seems to be quite in accordance with the 

 description given by Farlow (1. c), S pal din g^) and the detailed 

 description as to its origin and development by Miss Smith ^) and 

 now by Lewis. 



Finally, Fig. 20 D shows a terminal cell of the male plant 

 with the characteristic cap-like disc of antheridia in accordance 

 with the first description by Farlow and now in more detail by 

 Lewis. 



1) Vickers, A., Liste des algues marines de la Barbade. (Ann. Sc. Nat. Bot. 



9e serie, t. 1, 1905.) 

 -) Spalding, V. M., Development of the Sporocarp of Griffithsia Bornetiana. 



Proc. Am. Assoc. Adv. Science, 39, 1890. 

 3) Smith, A. A., The development of the cystocarp of Griffithsia Bornetiana. 



Bot. Gazette, XXII, 1896. 



