ioi6 
'Family Oscillatoriaceæ. 
11. Oscillatoria amphibia Ag. — Antioquia : n os r, 2, 5 , 6 and i 3 . 
12. Oscillatoria chlorina Kütz. — Cundinamarca : n u 19. 
1 3 . Oscillatoria formosa Bory. — Anlioquia n° 6. 
Oscillatoria limosa Ag. — Antioquia n° 6. 
i 5 . Oscillatoria splendida Grev. — Cundinamarca: n° 19. 
The extremities of the filaments vvere much attenuated and capitate. 
i( 3 . Oscillatoria tenuis Ag. — Antioquia: n os 1 and 2. Cundinamarca: n 0s 16, 22, 
and 24. 
Var. tergestina (Kütz.) Rabenh. — Antioquia: n° i 3 . 
17. Phormidium fragile (Menegh.) Gom. — Antioquia n° 10. 
18. Phormidium tenue (Menegii.) Gom. — Cundinamarca: n os i 4 and 17. 
19. Lyngbya bipunctata Lemm. — Antioquia: n os 1 and 2 ; crass. fil. 1 p.. 
20. Lyngbya putealis Mont. — Antioquia : n° 4 . Crass. fil. 9 p. ; crass. trich. 6-8 p.. 
21. Lyngbya major Menegh. — Antioquia: n° 6. Crass, fil. 19 20 p. ; crass. trich. 
i 4,5 p.. 
22. Lyngbya sp. ad L. æstuarum Liebman accedens ; crass. fil. 27 p. ; crass. trich. 
22 p.. Cundinamarca: n° 21 (plankton). 
Only a few fragmentary filaments of this species were observed, and its exact iden- 
tification was therefore uncertain. 
Family JSoslocaceæ. 
23 . Nostoc paludosum Kütz. — Antioquia: n° 10. Cundinamarca: n° 24. 
24. Anabæna flos-aquæ (Lyngb.) Bréb. — Cundinamarca: n° 21 (plankton). 
Several stérile species of Anabæna were observed from Antioquia (n os 1 and 2) and 
Cundinamarca (n° 24), but they were too fragrnentary for certain identification. 
25 . Cylindrospermum minimum Sp. nov. 
C. filis in stagnis natant.ibus, non in strato aggregatis ; trichomatibus pallide ærugi- 
neis, brevibus, subrectis vel leviter curvatis ; cellulis cylindricis, diametro 1 72* 2 - pI° lon- 
gioribus, polis rotundato-truncatis ; heterocyslis parvis, ellipsoideis vel ovoideis ; sporis 
angustis et cylindrico-oblongis, episporio glabro. 
Crass. céll. 1,8-2 p.; crass. heterocyst. 2-2,2 p.; long, heterocyst. 2, 5-2, 7 p. ; long, 
spor. 7,5-iop.; lat. spor. 3 , 3 - 3 , 7 p;long. tôt. trich. (ut visis) 5 o -64 p-. (PI. XXI, fig. i- 3 ). 
Antioquia : Laguna above Estrella near Medellin, Central-Andes ; altit. 23 oo m. n° 3 . 
This minute Cylindrospermum is the smallest of ail the known species of the genus, 
and was observed in quantity lloating freely among other Algæ. It is distinguished from 
