36 H. et J. Gro\'es: 



Statura mediocris. Caulis tenuisculus. Verticilli steriles et fer- 

 tiles similes. Eamuli verticillorum er. 7, 2 — 3- (nonnuuqiiam 4-)plo 

 furcati. Radii ad furcani priiiiam 5 — 6, ad secundara 3 — 5 (quorum 

 2 — 3 simplices), ad tertiam et quartam pq. 3. Ramuliis radio primario 

 plerumqiie duplo lougior. Radii ultimi bicellulares nonnuUi brevissimi, 

 cellula inferiore subfastigiata ad apicem rotuudata. Antlieridia et 

 oogouia pii- ad furcas secundas et tertias (rarissime oogonia etiani ad 

 primas) posita. Antlieridia diametro -22 — 34 mm. Oogonia solitaria 

 üvoidea. Coronula persistens. Oospora subpallide briinnea paulo com- 

 planata, -27 — 4mm. longa, -2 — 33 mm. lata, liras 6 — 7 exhibeus. 

 Membrana reticulata. Monoica. 



Hab. in Cuba: C. Wright 18G5 n. 3920; Portorico propc ßaya- 

 mon in flumine 21. Mart. 1885: Sintenis n. 1058, prope Fajardo in 

 flumine ad mont. versus, April. 1885: idem n. 1059 pro parte, prope 

 Luquillo, 24. Mai. 1885: idem n. 1697, prope Jayuya in flumine 

 Caunilla, 4. Mart. 1887: idem n. 6307 et A. 113. 



Distributio: Asia: Java, India, Ceylon, Hongkong; Africa: In- 

 sulae Cöraorenses; America sept: Texas, Georgia; America austr.: 

 Brasilia, A''enezuela; Australia: Queensland. 



The leng'th of tlie ultimate raj^s varies considerably in this species. 

 In tlie specimen frora Lnquillo tliey are more uniformly shortened tlian iu 

 the otlier West Indian specimens, while on the other band the specimens 

 from Bayamoii aud Jajniya show a distinct tendency towavds N. didyosperma. 



10. Nitella microcarpa A.Braun in Monatsh. Berl. Ähad. 18 58 

 p. 357; Nordstedt in Hedivigia 1888 p.l83, in Act Univ. Lund. XXV 

 (1889) De AUjis et Charac. p. 11. 



Statura variabilis. Caulis crassiusculus. Rarauli verticillorum 

 6 — 8, 3 — 4 -(rar. 2-) furcati, radiis valde divergentibus. Radii ad 

 furcam primam 4 — 6, ad secundam 3 — 5, ad tertiam et quartam 2 — 4. 

 Radii primarii dimidio longitudinis ramulorum pq. breviores. Radii 

 Ultimi bicellulares pq. breves, cellula inferiore parte superiore angustata, 

 cellula ultima comparato longa et angusta valde acuta. Antheridia 

 et oogonia ad furcas secundas et tertias, oogonia quoque ad primas, 

 posita. Antheridia diametro -2 — 27 mm. Oogonia pq. 2 — 4 aggre- 

 gata, nonnunquam ad furcam secundam et tertiam solitaria. Coronula 

 persistens. Oospora pallide brunnea, multo complajiata, -18 — 27 mm.: 

 longa, -15 — 23 mm. lata, 5 — 6 liras exhibeus, membrana manifeste 

 et subtiliter reticulata. Monoica. 



Hab. in Cuba: C. Wright 1865 n. 3919, 3921, prov. Habana 

 prope Vento, 10. Febr. 1905: Abarca n. 4539 immatura, sed verisimiliter 

 forma ampla hujus spcciei; Jamaica ad Charlton er. 1000 ft.: W.Harris 

 u. 6706 pro parte; (ruadcloupe: Duchassaing (fide Braun). 



