io44 
Long. a 4,5 y. ; lat. cum proc. 25 p. ; lat. isthin. g y.. (PL XXI, fig. 33 ). 
Antioquia : Bog near the Laguna above Medellin, Central Andes ; altit. 23 oo m. 
N» 5 . 
This variety should be compared wilh St. subpolymorphum Bouge, described from 
Brazil in igo 3 . It seems scarccly possible to regard Borge’s species as other lhan a form 
of St. distentum. 
266. Staurastrum gemelliparum Nordst. forma minor. Long, cum proc. 20 y. ; 
lat. cum proc. 18 y.. — Antiocpiia : n 0i 1 and 2. 
267. Staurastrum gyratum W. and G. S. West in Ann. Boy. Botan. Gard. Calcutta, 
VI, 1907, p. 219, t. 1 5 , f. 27. 
Var. divergens var, now. 
Var. corpore semicellularum paullo minore ; processibus validioribus et crassioribus. 
Long, sine proc. 8 p., cum proc. 18-19 p.; lat. sine proc. cire. 7,5-8 p., cum proc. 
23 - 2(5 p. ; lat. isllnn. 4 p-- (PL XXI, fig. 3 o). 
Candinamarca : Laguna de Ubaque, Eastern Andes ; altit. 2066 m. N° 2.3. 
268. Staurastrum hirsutum (Ehrenb.) Bréb — Cundinamarca : n° il\. 
269. Staurastrum illusum spec nov. 
St. minutum, paullo latins quam longum, profundissime constrictum, sinu acutan- 
gulo et leviter aperto ; semicellulæ transverse elliptico-oblongæ, dorso convexiori quam 
ventro, angulis lateralibus late rotundatis ; a vertice visse triangulares, angulis rotunda- 
tis, lateribus valde concavis ; membrana tenuissima et punctata. 
Long. 19-20 p. ; lat. 21 y. ; lat. isthm. 5-6 p.. (PI. XXI, fig. 26). 
Antioquia : Laguna above Estrella near Medellin, Central Andes ; altit. 25 oo m. 
N° 3 (abondant). 
It is only after careful deliberation that I venture to describe this Desmid as a new 
species. Ils allies are St. muticum Bréb. and St. lanceolatum Arch., but tliere is litlle 
doubt that it would be quite wrong to refer it to eilher of those species. It, is much 
more délicate than St. muticum , wilh more depressed semicells, wilh narrower angles 
in the vertical view, and a very distinctly punctate cell-wall. From St. lanceolatum var. 
comprcssum it differs in the rounded latéral angles of the semicells, in the more concave 
sides of the vertical view, and in the punctate cell-wall. 
270. Staurastrum inconspicuum Nordst. — Cundinamarca : n° 24. 
271. Staurastrum leptocladum Nordst. forma africanum G. S. West in Journ. 
Linn. Soc. Bot. XXXVIII, 1907, p. 129, t. 6, f. 12. 
Semicellulæ a vertice visæ corpore rhomboides-rotuudato. Long. 4 <> 4 2 P- 5 lat. sine 
proc. cire. 20-21 p., cum [troc. 1 36 - 1 48 y.; lat. bas. semicell. io-io ,5 p. ; lat. isthm. 7 y. ; 
crass. 17 y.. — Cundinamarca: n° 23 . 
Except for the rhomboidal shape of the body of the semicells as seen in vertical view 
the specimens were identical in ail respects with those originally described from Nyasa 
and Victoria Nyanza. 
