Characeae. 35 
lorum 6—7 tenuissimi reeti, 2—4- (pqg. 3-)plo furcati. Radii ad 
furcam primam 5— 7, ad secundam 4—6 (quorum 1—3 simplices), ad 
tertiam 3—5. Radii ultimi 2- (rarissime 3-) cellulares. Antheridia 
et oogonia solitaria ad furcas secundas et tertias (raro ad primas) 
posita. Antheridia diametro -14—-21 mm. Oogonia late ovoidea, 
coronula parva. ÖOospora aureo- vel fusco-brunnea, multo complanata, 
-18—.26 mm. longa, -15—-23 mm. lata, -1— 17 mm. crassa, 6—8 
liras exhibens. Membrana reticulo elevato inaequali tecta, eujus lirae 
pg. in papillis distinetis sursum productae. Monoica. 
Hab. in Cuba, 1865: C. Wright n. 3921, pro parte; Sto. Do- 
mingo: Bertero. 
Distributio: Europa; Asia: India, Japonia; Africa: Algeria; 
America sept.: Canada, Civitates unitae. 
In the West Indian speeimens the antheridia are often produced at 
the first forking of the branchlets and the marking of the oospore-mem- 
brane is formed of an imperfect network of ridges with papillae usually 
showing only at the angles instead of a network former of lines of separate 
papillae as in the typical form. 
8. Nitella dietyosperma Groves in Journ. Linn. Soc. Lond. 
AXXIT (1898) p. 324 1.19. 
Statura medioeris. Caulis tenuis. Ramuli vertieillorum er. 6, 
2—3-plo furcati. Radii ad furcam primam pq. 5—6, ad furcam 
secundam 3—4, quorum 1-—2 pgq. denuo furcati. Ramulus 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 apieem rotundata. 
Antheridia diametro -27—-3 mm., ad furcam secundam et nonnun- 
quam tertiam posita. Oogonia solitaria ovoidea, ad furcam secundam 
et nonnunguam 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 An tigua, about !/, mile from the Port, near the hospital 
18. Jan. 1895: T. B. Blow; Guadeloupe dans un canal d’eau douce 
ad Bouillante, alt. 120 m., 20. April. 1899: Pöre Duss n. 3990. 
Closely allied to N. oligospira, with which it should perhaps be 
combined, but it never has the ultimate rays regularly shortened as in the 
Polyglochin group, having only occasionally one shortened as in some of 
the Mucronatae. 
9. Nitella oligospira A. Braun in Monatsb. Berl. Akad. 1858 
P. 357; Nordstedt in Hedwigia 1888 p.194, in Act. Univ. Lund. XXV 
(1889) De Algis et Characeis p. 11. 
3%* 
