Characeae. 31 
Ramuli vertieillorum inter se dissimiles, primarii majores, secun- 
darii minores et simpliciores duobus ordinibus, quorum alter 
supra, alter infra majores instructi Heterophyliae. 
11. N. hyalina. 
Coronula oogonii ‘e cellularum vertieillo pentamero unico constructa”. 
Caulis corticatus vel ecorticatus. Ramuli simplices. 
 Chareae. 
Oogonia e latere (pq. superiore) cellulae antheridium (in monoiecis 
conjunctis) vel bracteam (in monoieis sejunctis et dioeeis) susti- 
Banüs.nala ’. 2. , an u 
Stipulodia in serie unica . . . . . Haplostephanae. 
Stipulodia ramulorum numerum aequantia. 
12. ©. Braumii 
Stipulodia ramulo cuique duo. 
Dioica, planta magna, caulis diametro er. 1-3 mm. 
13. ©. Hornemanniı. 
Monoica, planta tenuis, caulis diametro cr. -3 mm. 
14. ©. Hydropitys. 
Stipulodia in seriebus duabus . . . Diplostephanae. 
Antheridia et oogonia ad ramulorum nodos diversos sita. 
15. ©. sejuncta. 
Antheridia et oogonia ad ramulorum nodos eosdem sita. 
16. ©. zeylanica. 
I. Nitella Agardh. 
1. Nitella oeeidentalis Allen in Bull. Torrey Bot. Club vol. XXI 
(1894) p. 166 t. 187. 
Statura parva. Caulis tenuis. Ramuli vertieillorum 8, incurvati, 
semel furcati. Radii secundarii 2—3, unicellulares acuminati. Oogonia 
solitaria vel geminata, late ovoidea magna, cellulis spiralibus ad apicem 
maturitate turgidis. Coronula decidua. Oospora intense castaneo- 
brunea, cireiter -4 mm. longa, -35 mm. lata, paulo complanata, 7—8 
liras exhibens, membrana crassa leviter et irregulariter rugosa. Dioica. 
' [Plantam masculam ex Antill. nos non vidimus.] 
Hab. in Cuba in Rio Saltadero: Linden (Herb. Berol.). 
This was labelled by Braun ‘N. acuminata v. subglomerata?’; but the 
fruit resembles that of N. opaca rather than N. acuminata, and we have 
found no trace of antheridia, although there are quite young oogonia, so that 
we conclude that it is dioecious. Dr. Aruzn has described four North American 
Species of a group which he separates from N. opaea by the acuminate terminal 
Yays, viz. N. montana, N. Blankinshipii, N. missouriensis and N. oceidentalis. 
Liven’s plant is evidently closely related to these and comes nearest to 
the last named, which was described from California, and we have therefore 
‚provisionally referred it to that species. We are however inclined to think 
that all four of Auury’s plants may have to be united into a single species, 
