Characeae. 35 



lorum 6 — 7 temüssimi recti, 2 — 4- (pq. 3-)plo furcati. Radii ad 

 furcani primam 5 — 7, ad secimdam 4 — 6 (quoruni 1 — 3 simplices), ad 

 tertiam 3 — 5. Radii ultimi 2- (rarissime 3-) celliilares. Autheridia 

 et oogonia solitaria ad furcas secundas et tertias (raro ad primas) 

 posita. Antheridia diametro -14 — 21 mm. Oogouia late ovoidea, 

 coronula parva. Oospora aureo- vel fusco-brimnea, raulto complanata, 

 • 18 — 26 mm. longa, -15 — 23 mm. lata, -1 — 17 mm. crassa, 6 — 8 

 liras exliibens. Membrana reticulo elevato inaequali tecta, cujus lirae 

 pq. in papillis distinctis sursum productae. Monoica. 



Hab. in Cubä, 1865: C. Wriglit n. 3921, pro parte; Sto. Do- 

 mingo: Bertero. 



Distributio: Europa; Asia: India, Japonia; Africa: Algeria; 

 America sept: Canada, Civitates unitae. 



In the West Indiaii specimens the antheridia are often produced at 

 the first forking of the l)ranchlets and the marking of the oospore-mein- 

 brane is formed of an imperfect network of ridges with papillae usnally 

 showing only at the angies instead of a network formed of lines of separate 

 papillae as in the tj^pical form. 



8. Nitella dictyosix'rma Groves in Jouru. Linn. Soc. Lond. 

 XXXIII (1898) p. 324 t. 19. 



Statura mediocris. Caulis tenuis. Ramuli verticillorum er. 6, 

 2 — 3-plo furcati. Radii ad furcam primam pq. 5 — 6, ad furcam 

 secundam 3 — 4, quorum 1 — 2 pq. deuiio furcati. Ramiüus radio 

 primario plerumque duplo longior. Radii ultimi bicellulares, longitudine 

 admodum inaequales, cellula superiore acuta -09 — 14 mm, longa, ad 

 basin -027 — 036 mm. lata, cellula inferiore ad apicem rotundata. 

 Antheridia diametro -27 — o mm., ad furcam secundam et nonnun- 

 quam tertiam posita. Oogonia solitaria ovoidea, ad furcam secundam 

 et nonnunquam tertiam (rarius ad primam) posita. Coronula minuta. 

 Oospora brunnea complanata, er. -28 mm. longa, -23 — 24 mm. lata, 

 er. -18 mm. crassa, 6 liras prominentes exhibens, membrana manifeste 

 reticulata. Monoica. 



Hab. in Antigua, about i/,, mile from the Port, uear the hospital 

 18. Jan. 1895: T. B. Blow; Guadeloupe dans un canal d'eau douce 

 ad Bouillante, alt. 120 m., 20. April. 1899: Pere l)uss n. 3990. 



Closely allied to N. ülifjospira, Avith Avhich it should perhaps be 

 combined, but it never has the ultimate rays regularly shortened as in the 

 Polyglochm group, having only occasionally one shortened as in some of 

 the Mucronatae. 



9. NiteHa oHgospira A. Braun in MonaUb. IkrI. Äkad. 1858 

 p.357; Nordsfedt in Iledivigia 1888 p.194, in Act. Univ. Lnnd. XXV 

 (1889) iJr Alcjis rl Chiiraccis p. U. 



3* 



