ANTITTIAMNIONELLA : A NEW GENUS OF ALG.E 



319 



find in the inner angles of, the verticils. They care ovoid, divide tri- 

 imgularly, and measure 40 ;u x 30 /x-25 /x x 30 ^ (Fig. -i). 



To tiie naked eye the plant has a speckled appearance, owing to 

 the pellucid nature of the joints and the concentration of colour- 

 matter in the verticils. 



2. Antitiiamnionella verticillata, nov. comb., is a fragile 

 little plant from South Africa, G-9 millimetres in length. The branch- 

 ing is alternate, with whorls of 4 ramelli at each joint ; the stems 

 have the same speckled appearance as A. scirniensis (Fig. 5). 

 The cells of the main stem measure G5 /x x 18 ^-90 /u x 20 //-, and the 



Antithamnionella sarnien- 

 Tetraspores. X 200. 



Fig. 3, — Antithamnionella sarniensis. Cells of main 

 stem, showing rhizoids and ramelli. X 100. 



ramelli of the verticils measure 155jux20/x. The tetraspores are 

 sessile in the upper axils of the whorls, and measure 30 /a X 50 ju ; they 

 divide triangularly. 



De Toni's description and references (Syll. Alg. iv. 1413; 1903) 

 are as follows : — 



" Antifhamnion? verticillatum (Suhr). CallitTiamnion verticil- 

 latum Suhr in Flora, 1840, p. 290, J. Ag. Sp. ii. p. 34, Epicr, p. 28. 

 Filo primario simplici ad geniculum qnodque ramis 3-4 verticil- 

 latis obsito, ramis alterne et fasciculatim ramulosis. Hab. ad Caput 

 Bonse Spei, Africae australis. Frons 6-9 millim. alta. An Sper mo- 

 th amnion ? " 



