578 



Howe : Phycological studies 



Acetabulum erenulatum 



Discs usually well-calcified and 

 whitish on drying, often 2 or 3 

 superposed, commonly infun- 

 dibuliform or cyathiform, 5—1 5 

 mm. broad ; sporangia (rays) 

 mostly 35—60, persistently co- 

 herent, strongly apiculate in 

 early stages, the apiculum 

 sometimes obscure with age ; 

 aplanospores 200-500 to a 

 sporangium. 



Acetabulum Farloivii 



Discs lightly calcified, green on 

 drying, solitary, nearly plane, 

 4-7.5 mm. broad; sporangia 

 (rays) mostly 20-30, lightly 

 coherent or often separate and 

 free, rounded-obtuse or trun- 

 cate at apex from an extremely 

 early stage ; aplanospores 40- 

 120 to a sporangium. 



The feature in which, chiefly, the original description given by 

 Solms needs amendment is in regard to the coherence of the rays. 

 A. Farloivii was placed by Solms in a group with A. Calyculus 

 under the caption " Rays even in the living state separate and 

 free." An examination of some thousands of individuals in the 

 living state leads us to the opinion that only about one in four or 

 one in five has the rays separate and free. However, clusters of 

 plants are found in which the rays of nearly every disc are dis- 

 crete ; other clusters in which the rays nearly always remain co- 

 herent, forming discs that are slightly concave or almost plane. 

 In some cases, the rays are apparently discrete from the first ; in 

 others, they have probably become more or less separated by 

 mechanical agencies. 



Specimens of Acetabulum Farlowii obtained by the writer at 

 Key West under the collection number i6j6 were distributed in 

 the Phycotheca Boreali-Americana as no. ioj2. We have not 

 met with the species in the Bahama Islands ; so far as known, it 

 is confined to southern Florida. 



Batophora Oerstedi J. Ag. Ofvers. Kongl. Vet.-Akad. Forh. 



11 : 108. 1854. 



Dasycladus Conquerantii Crouan ; Schramm & Maze, Essai Classif. 

 Alg. Guadeloupe, 47. 1865. — Maze & Schramm, Essai 

 Classif. Alg. Guadeloupe, 108. 1870-77. [According to 

 specimens in lib. Mus. Paris., and hb. Mus. Brit., distributed 

 by Maze and by Maze & Schramm.] 



Botryophora Conquerantii Cramer, Neue Denkschr. Schweiz. 

 Naturf. Ges. 32: 6. pi. 4./. 1. 1890. 



