Ali the specimens secn possessed an axile chloroplast (witli a central pyrenoid) in 
each semicell exactly as in lypical St. brevispinum. In onlline tlie vertical view was 
exactly I i k e that of the typical form, except for the inucros at (lie angles. The con- 
striction was in ail cases deeper than indicated by Wille, but noL more so lhan in 
the typical form. 
267. Staurastrum contectum Turner. — Anlioquia : n° 5 . 
268. Staurastrum cosmarioides Nordst. — Cundinamarca : n os 21 and 22. 
Long. 56 - 6 o p. ; lat. 32-36 g ; lat. isthm. 10-12 g. 
269. Staurastrum cuspidatum Bréb. var. columbianum var. now. 
Yar. minus et delicatulum, angulis semicellularum leviter inflatis ; a verlice visis 
lateribus concavioribus. 
Long. 16-17 ! 7 - 1 ^ at - sine spin. i 4 -i 6 p,; lat. c. spin. 23-25 p. ; lat. isthm. 4,6 p.(Pl. XXI, 
fig. 28). 
Anlioquia : Laguna above Medellin, Central Andes.; ait. 2600 m. N os j and 2. 
This is the most debcate variety of St. cuspidatum yel described, and in the front 
view it recalls in some respects St. subscolapacinum AV. and G. S. West (in Trans. 
Linn. Soc. Bot. ser. 2, V, 1896, p. 266, t. 16, f. 1 1 ). 
260. Staurastrum cyrtocerum Brf.b. — Antioquia : n° 5 . 
261. Staurastrum dejectum Bréb. — Antioquia : n° 4 - 
262. Staurastrum denticulatum (Næg.) Arch. — Antioquia : n° 6. 
263. Staurastrum Dickiei Ralfs var. minutum var. nov. 
Var. minutum, cellulis profundissime constrictis. 
Long. i 5 p. ; lat. sine spin. 16 y ; lal . c. spin. 20 p.; lat. isthm. 3,6 p. (PI. XXI, fig. 27) 
Antioquia : Bog near the Laguna above Medellin, Central Andes ; altit 23 oo m. 
N° 5 . 
x\ small form of this species was described by Schmidle (in Oesterr. bolan. Zeit- 
schr. 1896-6, p. 24, t. 16, f. 29) as forma parva , but this form cannot in any way be 
confused with var. minutum, and its wide isthmus and peeuliar vertical view make it 
doubtful whether it is really a form of St. Dickiei. 
It is a noleworthy fact that lhe largest forms of S. Dickiei also occur in America, 
the North American specimens of St. Dickiei var. maximum W. and G. S. West atlai- 
ning a length of 69 p. and a breadth“(wilh spines) of 86 p.. ( Vide W. and G. S. West 
in Trans. Linn. Soc. Bot. ser. 2, V, 1896, p. 266, t. 1 8 , f. i 3 ). 
264. Staurastrum dilatatum Ehrenb — Antioquia : n° 3 . Cundinamarca : n° 24 - 
266. Staurastrum distentum Wolle, 1882 ; Desm. U. S. 1 834 ? p- 1 49 ? t- 4 b L i 5 , 
16 ; char, emend. W. and G. S. West in Journ. Linn. Soc. bot. XXXI 1 J, 1898, p. 3 r 6 , 
fig. xylogr. 6 d-f. 
Var. columbianum var. nov. 
Var. circiter tam longum quam latum, spina simplice parva ad basin processuum 
uniuscujusque utrobique. 
