— 1017 — 
C. minutissimum Collins (in Erylhea, 1896, p. 120) by its rallier narrower trichomes, 
its smaller and ellipsoidal heterocysts, and lhe much smaller size of its spores. In fact, 
the mature spores are scarcely hall’ the size of Ihose of C. minutissimum, and Collins 
also States thaï in his species there are no constrictions betvveen the végétative cells. 
Anolher species vvith which C. minimum should be compared is C. Goetzei Schmidle (in 
Engler, Botan. Jahrb. XXX, 1902, p. 245, t. 4 , f- 5 ), from which il differs in its more 
slender trichomes, its shorter and more rounded heterocysts, and in the much smaller size 
of its spores. 
26. Cylindrospermum majus Kürz. forma minor. 
Crass. trich. 3-3,2 p. ; long, heterocyst. 7,6-8 g; lat. heterocyst. 3,5 p.; long. spor. 
19-21 p. ; lat. spor. 9 p.. Episporio minute papillato, fuscescente. 
Cundinamarca : n os i 4 and 24. 
This form was only seen in small quanlity and does not appear to differ from 
C. majus except in its slightly smaller size. 
27. Nodularia turicensis (Cramer) Hansg. — Cundinamarca: n° i 4 - 
28. Nodularia tenuis G. S. West in Trans. Linn. Soc. Bot. XXXVIII, 1907, p. 171. 
Sporis oblongo-cylindricis, diametro 1 i / 3 - 1 J / 2 plo longioribus, seriatis. Crass. trich. 
3 - 3,3 p. ; crass. heterocyst. 5 , 5 - 5 , 8 p. ; long, heterocyst. 7,2-8 p. ; long. spor. io-i 4 (usque 
ad 18) p. ; lat. spor. 6-7 p.. (PI. XXI, fig. 4 * 5 ). 
Cundinamarca: n° 17. 
The South American form differed only from the African one in the slightly narro- 
wer trichomes and in the doser approximation of the heterocysts ( 36-64 p- aparl). The 
spores were not observed from Africa. 
In collection n° i 4 from the Department of Cundinamarca there were two olher 
species of Nodularia , but neither were in a proper condition for satisfactory identifi- 
cation. 
Family Microchætaceæ . 
29. Microchæte crassa sp. now. 
M. in cæspitibus parvis (e fi lis paucis composilis) ad plantas aquaticas affixis ; fi 1 is 
leviter flexuosis 2-2,5 mm. longis, cylindricis sed levissime attenuatis basin versus ; vaginis 
achrois, hyalinis (non lamellosis), firmis et continuis; trichomatibus apicem versus paullo 
crassioribus, ad dissepimenta non constriclis et non granulatis ; cellulis basin trichomatis 
versus diametro paullo longioribus, apicem versus diametro paullo brevioribus ; cellula 
apicali depresso-conica ; heterocystis plerumque basalibus, globosis. 
Crass. fil. 1 3 - 1 6 p. ; crass. trich ad bas. 9-10,5 p. ; ad apic 1 2- 1 3 p. ; diam. heterocyst. 
basal. 9-10,5 p.. (Texl-fig. 1). 
Cundinamarca : Laguna de la Savane de Bogota, Easlern Andes; allit. 2680-2600 m. 
n° 1 4 . 
128 
