32 H. et J. Grovss: 
in which case one of the earlier names must be adopted. The Berlin spe- 
cimen represents a very slender plant, with the habit of. N. graeilis. The 
measurements in our description are taken from the West Indian plant, the 
oospore of which is slightly larger than in Auuen’s plant. 
2. Nitella eernua A. Braun in Monatsb. Akad. Berl. 1858 p. 354; 
Fragmente Monogr. Charac. (1882), tab. I fig. 12—19; Nordstedi in 
Hedwigia 1888 p. 194 et in Act. Univ. Lund. XXV (1889): De 
Algis et Characeis p. 6 t.1 f. 19. 
Caulis maxime crassus, diametro usque ad 2 mm., minime ramosus. 
Ramuli vertieillorum sterilium 5—8, semel furcati, radiis primariis 
maxime crassis et elongatis, radiis secundariis 3--5, unicellularibus 
minutis acuminato-ovoideis. Vertieilli fertiles minuti in muco in- 
voluti, super ramis axillaribus nonnunquam elongatis et recurvis siti. 
Ramuli verticillorum fertilium 6—8, semel furcati, radiis primariis 
pq. brevibus, sed nonnunquam elongatis, secundariis unicellularibus 
acuminato - ovoideis brevissimis quam antheridii diameter multo 
brevioribus, oogonii longitudinem !/,—1!/, aequantibus. Antheridia 
solitaria, diametro cireiter -95 mm. Oogonia solitaria vel 2—3 aggre- 
gata. Coronula minuta. Oospora castaneo-brunnea vel nigra, -51— 
-62 ınm. longa, -5—-54 lata, paulo complanata, 6—8 liras tenues et 
prominentes exhibens, membrana valde crassa, irregulariter granülata. 
Dioica. | 
Hab. in Portorico prope Veja-baja 1887: Sintenis n. 6802; 
Antigua 1895: T.B. Blow; Marie Galante prope Grand Bourg, 
1895: Pöre Duss n. 3688. 
Distributio: America austr.: Venezuela, Fernando Noronha. 
One of the stoutest and most striking species of Nitella. The stem 
and branchlets have usually well-marked annular incrustation. 
3. Nitella acuminata A. Braun in Hooker’s Journ. Bot. I (Charae. 
Ind. Or.) 1849 p.292 et Fragmente (1882) 1. I f. 22— 26; Nordstedi 
in Hedwigia 1888 pp. 181 et 194; H. et J. Groves in Journ. Linn. 
Soc. Lond. XXXIII (1898) p. 325. — N. subglomerata Braun in 
Monmatsb. Akad. Berl. 1858 p. 356. 
Statura mediocris. Caulis modice crassus. ‘ Ramuli vertieillorum 
6— 8, semel furcati, radiis secundariis 2— 4 unicellularibus longe acu- 
minatis. Vertieilli fertiles super ramis brevibus siti, ramulis pq. bre- 
viores, capitula plus minusve densa conformantes. Antheridia diametro 
er. -27 mm. Oogonia pq. 2 vel plura aggregata. Oospora multo com- 
planata -24—-3 mm. longa, -2— 25 lata, cr. 7 liras exhibens, mem- 
brana tenui prominentiis magnitudine et conformatione inaequalibus 
conspersa. Monoica. 
