1028 
ellipticis, margine uno convexo, margine altcro valde convexo, polis subtruncalis ; mern- 
brana sporarum subcrassa, luteola et dense punctata. 
Lat. ce 1 1 . veget. i3-i5 g ; long, aplanospor. 34-38 g ; la t . aplanospor. 24-26 g. 
(PI. XXI, fig. 24.) 
Antioquia : Laguna above Eslella near Medellin, Central Andes ; altit. 2600 m. n° 4 - 
Tliis species seems well characterized by the great length of ils végétative cells, lhe 
numerous pyrenoids in the chloroplast, and lhe shape of lhe aplanospores. The chloro- 
plast only occupies about three-quarlers of the length of the végétative cell and the pyre- 
noids are arranged in an irregular sériés. The wall of the mature aplanospore is fairly 
thick, of a yellow or yellowish brown colour, and finely punclate. 
[42. Mougeotia (Gonatonema) tenerrima sp. nov. 
M. (G.) cellulis vegelativis tenerrimis, diametro circiter 2.5-3o-plo longioribus, chro- 
matophora cuni pyrenoidibus 6 in sérié singulo ; aplanosporis ellipticis vel leviter oblique 
ellipticis, diametro circiter duplo longioribus, polis leviter produclis et submamillatis, 
membrana glabra. 
Lat. cell. veget. 4,5 g; long, aplanospor. 24-26 g, lat. 1 2- 1 3 p.. (PI. XXI, fig. 26.) 
Antioquia : Laguna above Medellin, Central Andes ; altit. 23 oo m. N os 1 and 2. 
This Alga should be compared with Mougeotia ( Gonatonema ) Boodlei (W. and 
G. S. West) Collins (cfr. W. and G. S. West in Trans. Roy. Micr. Soc. 1897, p. 4 y 6 ; 
Ann. Bot. XII, 1898, t. 4 , f- 1-9), from wliich it differs in its narrower and proportiona- 
tely longer cells, and in lhe shape of the aplanospores. The latler are relatively narrower 
and possess submamillate polar thickenings. 
r 43 . Mougeotia sp. ad M . minutissimam Lemm. accedens. Lat. cell. veget. 3,5 p. j 
long. cell. 54-58 p, ; chromalophora cum pyrenoidibus 5 - 6 ; sporis non visis. — Antio- 
quia: n° 10. 
1 44 - Zygnema sp. (stérile). Crass. cell. veget. 16,6-19 p. ; inter cellulas leviter con- 
striclum. - — Antioquia: n° 4 - 
t 45 . Zygnema sp. (stérile). Crass. cell. veget. 22-23 p.. — Antioquia: n os 1 and 2. 
1 46 . Zygnema ericeiorum (Kütz.) Hansg. — Antioquia : n os 1 and 2. 
147. Spirogyra decimina (Müll.) Kütz. forma tropica G. S. West in Journ. Linn. 
Soc. Bot. XXXVIII, 1907, p. 106. S. decimina forma W. and G. S. West in Botan. 
Tidsskrift, XXIV, 1901, p. 161. 
Crass. cell. veget. 48-53 p. ; long, zygosp. 90-107 p. ; lat. zygosp. 48-49 p- 
Antioquia: n" 8. 
This form agreed in ail respects with the Asiatic and African specimens previously 
described. 
1 48 . Spirogyra splendida spec. nov. 
Sp. maxima, cellulis vegetalivis diametro 1 V3-2-PI0 longioribus, membrana 4 P- crassa, 
extremilatibus non replicatis; chromatophoris 5-6 (plerumque 6) dense aggregatis, lalis 
cum marginibus irrégularité!’ asperis, pyrenoidibus magnis subconferte ordinalis, anfrac- 
