Nostoc] XVIII. NOSTOCE^ (West). 373 



XVIII. nostocej:. 



1. NOSTOC Vauch. (1803). 



1. N. repandum W. et G. S. West in Journ. Bot. 1897, p. 267. 

 PuNGO Anpoxgo. — Freq. ad rupes editiores vulcan. Prsesidii prope 



Cabondo tempore pluvio, intra dies duas tresve ingente copia obvia ; 

 Feb. 1857. No. 21. 



The nearest species to this is N. Mimifusmn Carm., from which 

 it is distinguished by its very large coriaceous non-tuberculate 

 thallus, by its constantly elliptical or doliform cells, and by its larger 

 heterocysts and spores. 



2. N. paradoxum Welw. ex W. et 6. S. West in Journ. Bot. 

 1897, p. 268. 



PuNGO Akdongo. — Ad muscos dense cpespitosos juxta rivulos prope 

 Pedra Songue in ips. Prsesidio ; April 1857. No. 20. 



This species belongs to that division of the section Humifusa with 

 cylindrical cells. 



3. BT. museorum Ag. Dispos. Algar. Suae. 44 (1812) ; Kiitz. 

 Tab. Phyc. ii. (1850-2), 2, t. 5, f. iv. ; Bom. et Flah., I.e., vii. 

 200-1 (1888) ; W. et G. S. West, I.e. 



PuNGO Andoxgo. — Ad rupes schist, pr. Candumba-Calundo ; Jan. 

 1857. No. 22. Cambondo ad rupes ; Feb. 1857. No. 285. 



4. "S. minutum Desmaz. Plantes Cryptog. du Nord de la France, 

 fasc. xi. no. 501 (1831) ; Born, et Flah., I.e., 209 (1888); W. et 

 G. S. West, I.e. 



This is not identified with certainty, as it was seen in very small 

 quantity ; spores elliptical, concatenate. 



MossAMEUES. — Inter (Edogonii sp. in stagnis puris ad ripas flum. 

 Bero ; Aug. 1859. No. 190. 



2. ANAB-ffiNA Bory (1822). 



1. Anabsense sp. W. et G. 8. West, I.e. 



GoLUNGO Alto. — Specimens very fragmentary, and spores not 

 attached to the trichomes. 



Freq. sed cito marcescens ad latera rivuli Coango ; Aug. 1857. 

 No. 163. 



XIX. CAMPTOTRICHE^. 



W. et G. S. West in Journ. Bot. 1897, p. 268. 

 1. CAMPTOTHRIX W. et G. S. W^est, I.e., p. 269. 



1. C. repens W. et G. S. West, I.e. 



HuiLLA. — Epiphytica supra Schizotrichem natcmtem et Microcoleum 

 sociatum, in uliginosis editioribus prope Humpata, Empalanca et 

 LopoUo, plagas spongiosas unacum Eriocauloneis, Xyridibus et Utricu- 

 lariis constituens, 6000 ad 5500 ped. elevat. ; May 1860. No. 15. 



The diverse forms of the cells and their irregular disposition in the 

 short tapering filaments give a character to this genus not possessed by 

 any other of the genera of either the Vaginarieos or the Lyngbyem, and 

 necessitated the plant being placed as the type of a new order {Campto- 

 triche<B) of Hormogmiece Homocystecc. 



VOL. II. 25 



