Cosmariuni] xi. desmidiace.e (West). 357 



Var. africanum W. et G. S. West in Journ. Bot. 1897, p. 17S, 

 t. 367, f. 14. 



HuiLLA. — In paludibus exsiccandis ; April 1860. No. 176. Inter 

 Utriculariam, Morro de Lopollo ; April 1860. No. 179. 



55. C. huillense W. et G. S. West in Journ. Bot. 1897, p. 174, 

 t. 367, f. 15. 



HuiLLA. — In paludibus exsiccandis ; April 1860. No. 176. 



This differs from C. taxlchondrum Lund, in having three groups of 

 granules on each semi-cell, one across the front of each side of the semi- 

 cell and one at the apex, in the more numerous and smaller granules, 

 and in the presence of minute scrobiculations round these granules. 



56. C. angolense W. et G. S. West in Journ. Bot. 1897, p. 174, 

 t. 367, f. 7. 



HuiLLA. — In paludibus exsiccandis ; April 1860. No. 176. 

 The two series of spines in vertical view are concave towards each 

 other. 



57. C. tetrastichum W. et G. S. West in Journ, Bot. 1897, 

 p. 174, t. 367, f. 9. 



HuiLLA. — Inter Utncularlain, Morro de Lopollo ; April 1860. 

 No. 179. Morro de Lopollo ; Feb. 1860. No. 192. 



Var. depauperatum W. et G. S. West, I.e., t. 367, f. 10. 

 HuiLLA. — In paludibus exsiccandis ; April 1860. No. 176. 



58. C. subspeciosum Nordst. in Ofv. af K. Vet.-Akad. Fbrh. 

 no. 6, 22, t. vi. f. 13 (1875) ; W. et G. S. West, I.e., p. 175. 



A form which is most probably var. validms Nordst., but 

 ^ specimens not in a condition for the satisfactory determination of 

 this point. 



PuNGO Andongo.— In rivulis Prcesidii (Casalale') : March 1857. 

 No. 105. 



59. C. Welwitschii W. et G. S. West in Journ. Bot. 1897, 

 p. 175, t. 367, f. 2. 



HuiLLA. — In paludibus exsiccandis ; April 1860. No. 176. Etiam 

 inter Utriculnrtain, JVIorro de Lopollo ; April 1860. No. 179. 



This handsome species approaches C. Lagerheimianuiii W. et G. S. 

 West, I.e. \_Diji<j)h'nict'n(m Lagi'rhe'nnicumm W. B. Turn, in K. Sv. 

 Vet.-Akad. Hand). Bd. 25, no. 5 (1893), 43, t. xxii. f. 6], but differs 

 greatly in its much deeper constriction, in its flattened apices, in the 

 double series of emarginate warts, in the shorter conical warts (not 

 elongated papilltB), and in the very densely scrobiculate membrane. 

 In the vertical view the double series of emarginate warts are concave 

 towards each other in the centre, and subparallel towards the poles. 



60. C. aequinoctiale W. et G. S. West in Journ. Bot. 1897, 

 p. 175, t. 365, f. 11. 



LiiiONGO. — Ad margines flum. Lifune ; Sept. 1858. No. 204. 



This is distinguished from C. orljicuhituiu Ralfs in its less orbicular 

 semi-cells, its much broader isthmus, and in its smaller granules with 

 definite arrangement. Compare also with C. qualnm W. et G. S. West, 

 I.e. \_Djjsphinctiuiii qualum W. B. Turn.], 



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