io46 
282. Staurastrum spicatum W. and G. S. West in Journ. Bot. XXXIII, i 8 g 5 , 
p. 70; in Trans. Linn. Soc. Bot. ser. 2, Y, 1896, p. 258 , t. 16, f. 23 . St. dubium 
Eîchl. and Gutw., 1894 (non St. dubium W. West, 1890). 
Forma spinis ad angulos superiores semicellularum brevioribus et spinis ad angulos 
inferiores longioribus. 
Long, sine spin. 22 g, cuin spin. 29 g; lat. sine spin. 24 p, cum spin. 3 o- 3 i g; lat. 
isthin. 7 g. — Antioquia : n® 3 . 
283. Staurastrum tetracerum Ralfs. — Antioquia : n os 3 , 4 and 5 . 
284. Staurastrum trihedrale Wolle, i 883 ; Desm. U. S. 1 884 » p. 123 , t. 4 o, fig. 12, 
i 3 ; char, emend. W. and G. S. West, in Trans. Linn. Soc. Bot. ser. 2, V, 1896, p. 610, 
t. 16, f. 29. 
Long. 47 g ; lat. 33 g; lat. isthm. 12 g. 
Antioquia: n° 5 (frequent). Cundinamarca : n° 24. 
285. Sphærozosma granulatum Roy and Biss. — Antioquia : n os i and 2. 
286. Onychonema filiforma (Ehrenb.) Roy and Biss. — Antioquia : n° 5 . 
287. Spondylosium tetragonum W. West in Journ. Linn. Soc. Bot. XXIX, 1892, 
p. 1 15 , t. 1 g, f. 2. 
Forma paullo minor, cellulis le vi ter angustioribus. Long. 7, 5 - 8, 5 g; lat. 7-7,2 g; 
lat. isthm. 6 g; crass. 4 , 5-5 g (PI. XXIII, fig. 55 ). 
Forma trigona; cellulis a vertice visis triangularibus, angulis rotundàtis, lateribus 
concavis. Long. 8-9 g; lat. 6 - 8,3 g; lat. isthm. 5-5,7 F (PI- XXIII, fig. 56 - 57 ). 
Cundinamarca : n° 24 (both forms frequent). 
It would appear t liât Spondylosium Treubii Bernard (in Bull. Dép. de l’Agric. 
Indes-Néerl. 1909, p. 21, t. 1, f. 16) is only a form of Sp. tetragonum. 
288. Spondylosium ossiculorum spec. nov. 
S. par vu m, filis non tortis, sine vagina mucosa ; cellulæ circiter 1 1 / 3 -plo longius 
quam latum, subprofunde constrictum, sinu valde aperto et semicirculari ; semicellulæ 
subellipticæ, apice late convexo, sérié singulo punctorum (— pororum) transmedium 
semicellulæ uniuscujusque ; semicellulæ a vertice visæ late ellipticæ, a latere visæ depresso- 
subcirculares. 
Long. cell. 1 2-1 3,5 g ; lat. 9, 5 - 10 , 3 g ; lat. isthm. 5 - 5,5 g ; crass. 7-8 g (PL XXIII, fig. 54 ). 
Antioquia : Laguna above Estrella near Medellin, Central Andes ; altit. 25 oo m. 
N° 3 (frequent). 
Tliis is apparently a very distinct species. The single row of conspicuous punctae 
across the middle of eacli semicell really represents a transverse row of large pores in 
the cell-wall. 
289. Hyalotlieca dissiliens (Sm.) Bréb. — Antioquia: n os 1, 2, 3 , 4 and 5 . Cundi- 
namarca: n os 22 and 24. 
Large specimens of forma tridentula occurred from no 3 , and the specimens from 
n° 5 werc ail very small. 
