Protococcus] XIV. palmellacEjE (West). 367 



2. P. botryoides Kirchn. in Cohn, Kryptog. Flora Schles. Bd. 2, 

 Erste Halfte, 103 (1879) ; W. et G. S. West, I.e. 



Microkaloa botryoides Kiitz. Phys. General. 169 (1843); Tab. 

 Phyc. i. (1845-9), C, t. 7. 



LoANDA. — A light green coating on the inside of wooden water 

 reservoirs, often remaining dry, in the garden of Dr. Mendes Alfonso's 

 house ; Oct. 1858. No. 128. 



MYXOPHYCEJE. 

 XV. RIVULARIACEiE. 



1. CALOTHRIX Ag. (1824). 



1. C. fusca (Kiitz.) Born, et Flah. in Ann. 8ci. Nat. 7<= s6rie, 

 Bot. iii. 364 (1886) ; W. et G. S. West, I.e. 



Mastichothrix fusca Kiitz. in Phyc. General. 232 (1843). 

 PuN'GO Andoxgo. — In Batrachospermo gracillimo ad lapidea sub- 

 mersas in rivulo de Tangue ips. Prsesidii ; May 1867. No. 3. 



2. C. breviarticulata W. et G. S. West in Journ. Bot. 1897,. 

 p. 240. 



Pdngo Axdongo. — Epiphytica in Mougeotia angolensi ad ramulos 

 Podostemacearum ( Tristicha trifaria Tul. ) in rivulis Praesidii (Casalald) ; 

 March 1857 No. 105. 



The habit, together with the gradual attenuation of the filaments, 

 brings this nearest to C. adscendens (Nag.) Born, et Flah. (I.e., 365) ;; 

 but its smaller size, its shorter filaments, and its very short cells easily 

 distinguish it. The younger plants, which have only attained a 

 length of about 100 /i and a thickness of 6'5-7-5 /i., have their cells 

 only 2-3 times shorter than the diameter. It also comes near to 

 C. endophytica Lemmermann in Forschungsberichte Biolog. Station 

 zu Plon, iv. 184 (1896), but has a different sheath and very short 

 filaments ; the heterocysts are also very distinct. 



3. C. epiphytica W. et G. S. West in Journ. Bot. 1897, p. 240. 

 MossAMEDES. — Epiphytica in (Edogonii sp., freq. in stagnis puris- 



ad ripas flum. Bero ; Aug. 1859. No. 190. 



2. DICHOTHRIX Zanardini (1858). 



1. D. olivacea Born, et Flak, I.e., 375 (1886) ; W. et G. S. 

 West, I.e. 



Calothrix olivacea Hooker (1845). 



PuNGO Andongo. — Inter Scytonema MyochrousYar. ehorograpMcum, 

 in summis rupibus Prsesidii ; Feb. 1857. No. 6. Etiam inter Scyto- 

 nema Millei ad rnpes vulc. humectatas props Cacella ips. Prsesidii ; 

 Feb. 1857. No. 7. 



2. D. gypsophila Born, et Flah., Ic. 377-8 (1886) ; W. et G. S> 

 West, I.e. 



Sehizosiphon gypsophilus Kiitz. Phyc. Gener. 234, t. 6, fig. 2' 

 (1843). 



This seems to have been luxuriantly developed, and reached 

 5 mm. in height ; the filaments were not incrusted with lime, a* 

 is often the case with this species. 



