THE ALGAE OF BERMUDA. 125 



Weightiella Schmitz. 



1. Main axes virgate, except in the older parts beset with short, subequal 



ramuli. 1. W. Blodgettii. 



1. Branches of successive orders diminishing in size; ramuli of varjdng length. 



2. W. Tumanowiczi. 



1. W. Blodgettii (Harv.) Schmitz, 1893, p. 222; P. B.-A., No. 

 1942; Alsidium Blodgettii Harvey, 1853, p. 16, PL XV. B. Kemp, 

 specimen in herb, as Dasya mucronata, also unnamed specimen; Shelly 

 Bay, Feb., Harris Bay, Walsingham, April, Hervey; in pot-hole, 

 Gravelly Bay, April, Bethel's Island, Dec, Collins; tetraspores in 

 Jan. and April. 



2. W. Tumanowiczi (Gatty) Schmitz, 1893, p. 222; P. B.-A., No. 

 2095. Dasya Tumanowiczi Gatty in Harvey, 1853, p. 64. Moseley; 

 Buildings Bay, April, with cystocarps, Hervey. In this collecting a 

 single plant was found, dense and bushy and over 7 dm. high; over 30 

 good mounted specimens were made from it, but it was throughout 

 more slender than much smaller individuals of W. Blodgettii. In 

 appearance the two species are quite different, the stout spinous 

 branches of the latter are quite visible to the naked eye, and set all 

 over the plant; in W. Tumanowiczi they are hardly visible without a 

 lens. Technically, it is hard to find distinguishing characters; tetra- 

 spores and cystocarps are quite alike, and as suggested by Falkenberg, 

 1901, p. 559, they are certainly closely related. 



MuEEAYELLA Schmitz. 



M. PEEICLADOS (Ag.) Schmitz, 1893, p. 227; P. B.-A., No. 2096; 

 Hutchinsia periclados Agardh, 1828, p. 101; Bostrychia Tuomeyi 

 Harvey, 1853, p. 58, PI. XIV. E. Among Bostrychia species, on man- 

 groves and rocks, Tucker's Town, Hungry Bay etc.. Common as 

 scattered individuals among other species, rarely pure or constituting 

 the greater part of the growth. 



Heeposiphonia Nageh. 



1. Branches recurved. 3. H. peoten-veneris. 



1. Branches straight. , 2. 



2. Determinate branches about the same size as the axis. 1. H. secunda. 



2. Determinate branches about half the size of the axis. 2. H. tenella. 



