32 H. et J. Groves: 



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. grarilis. The 

 measurements in our description are taken from the West Indian plant, the 

 oospore of whioh is slightly larger than in Allkn's plant. 



2. Nitella ceriiua A. Brauu in Monafsh. Akad.BerL1858 p.354; 

 Fragmente Moiiogr. Cliarac. (1882), tab. I flg. 12 — 19; Nordstedt in 

 Hedidgia 1888 p. 194 et in Act. Univ. Limd. XXV (1889): Tk 

 Algis et Characeis p. 6 t. 1 f. 19. 



Caulis maxime crassus, diametro usque ad 2 mm., minima ramosus. 

 Raniuli verticillorum sterilium 5 — 8, semel furcati, radiis primariis 

 maxime crassis et elongatis, radiis secundariis 3 --5, iinicelliilaribus 

 minutis acuminato-ovoideis. Verticiili fertiles miniiti in muco in- 

 vüluti, 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 niulto 

 brevioribus, oogouii longitudinem ^j., — 1^., aequautibus. Antheridia 

 solitaria, diametro circiter -95 mm. Oogonia solitaria vel 2 — 8 aggre- 

 gata. Coronula minuta. Oospora castaneo-brunnea vel nigra, -51 — 

 ■62 mm. longa, -5 — 54 lata, paulo complanata, 6 — 8 liras tenues et 

 prominentes exhibens, membraua valde crassa, irregulariter granulata. 

 Dioica. 



Hab. in Portorico prope Veja-baja 1887: Sintenis n. 6802; 

 Antigua 1895: T. B. Blow; Marie Galante prope Grand Bourg, 

 1895: Pere 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 acumiiiata A.Braun in Hooker' s Joiüii. Bot. I (Charac. 

 Ind. Or.) 1849 p. 292 et Fragmente (1882) t. I f. 22 — 26; Nordstedt 

 in Hedwigia 1888 pp. 181 et 194; H. et J. Groves in Journ. Linn. 

 Sog. Lond. XXXIIl (1898) p. 325. — N. snbglomerata Braun in 

 Monatsb. Akad. Berl. 1858 p. 356. 



Statura mediocris. Caulis modice crassus. Ramuli verticillorum 

 6 — 8, semel furcati, radiis secundariis 2 — 4 unicellularibus longe acu- 

 minatis. Verticiili 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, er. 7 liras exhibens, meni- 

 brana tenui prominentiis magnitudine et conformatioue iuaequalibus 

 conspersa. Monoica. 



