WELWITSCH'S AFRICAN FRESHWATER ALG.^. 239 



2. G. RUPESTRis (Ljaigb.) Rabenh. Knjptofj. Flor. ScicJis. 128 

 (1863). Pahnella rupestris Lyngb. Tentamen Hi/drophyt. Dan. 207, 

 t. 69, fig. D (1819). Diam. fam. 13-33 //; diam. cell. 3-5-4-5 //. 



Pungo Andongo. Alga terrestris, ad ligna putrescentia in rnpi- 

 bus convallibus ; Nov. 1856. No. 110. 



3. G. VESICULOSA Nag. Gatt. einz. Alj. G6, t. iv. F(1849). Long, 

 cell. 9-10 IX ; lat. cell. 4-4-5 /x. 



Libongo. Ad margines flum. Lifune ; Sept. 1858. No. 204. 



11. Urococcus Kiitz. (1849). 



1. U. iNSiGNis (Hass.) Kiitz. Spec. Ahj. 207 (1849). Hamato- 

 coccus i)isi(/nis Hass. Brit. Fres/nv. AUj. 324, t. Ixxx. f. 6 (1845). 

 Chroococcus macrococcus Rabeub. Diam. cell. 40 /x. 



Huilla. In paludibus exsiccandis ; April 1860. No. 176. 



After enunciating the cbaracters of bis "First Subgenus" of 

 Htrmatococcus Ag., Hassall {Biit. Freshiv. AJ(j. i. 322) says tbat 

 "tbe term Ouracoccus migbt be applied to the species of this sub- 

 genus." Improving on this suggestion, Kiitzing, according to the 

 reference on p. 206 of his Species Ah/arum, establishes the genus 

 Urococcus of Hassall ; but it cannot be held to constitute publi- 

 cation of a new genus, and, if Urococcus is to stand, it must be as 

 Urococcus Kiitz. Spec. Al(j. 206 (1849). 



12. Stichococcus Nag. (1849) ; em. Gay (1891). 

 1. S. FLAcciDus (Kiitz.) Gay, Fiecherches quelq. Ah/. Vertes, 79, 

 t. xi. f. 101-106 (1891). Ulothrix flaccida Kiitz. Spec. Alqar. 349 

 (1849). Crass, fil. 5-5-7-5 fi. 



Loanda. Inter Frotococcum butnjoidem (Kiitz.) Kirchn. ; Oct. 

 1858. No. 128. 



13. Protococcus Ag. (1824). 



1. P. viRiuis Ag. Sijst. Alf/ar. 13 (1824); Kiitz. Tab. Fhi/c. i. 

 (1845-9), p. 3, t. 3. Diam. cell, 4-8-5 /x. 



Loanda. Ad parietes domorum &c. ssepius humectatas in ipsa 

 urbe Loanda, ast sparsim. Locus habitationis hujus algffi austium 

 versus spectat; July 1854, No. 126. 



2. P. BOTRYOiDEs (Kiitz.) Kirchii. in Cohn, Krtjptog. Flora Schlec. 

 Bd. 2, Erste Halfte, 103 (1879). Microhaloa botn/oides Kiitz. Phys. 

 General. 169 (1843) ; Tab. I'lnjc. i. (1845-9), 6, t. 7. 'Diam. c&U. 4-5 /x. 



Loanda. A light green cover, often remaining dry, on the 

 inner part of wooden water reservoirs ; Oct. 1858. No. 128. 



MYXOPHYCE/E. 



XV. RlVULARIACE^. 



1. Calothrix Ag. (1824). 



1. C. FUscA (Kiitz.) Born. & Flab, in Ann. Sci. Nat. 7e serie, 

 Bot. iii. 364 (1886). Mastichothrix fusca Kiitz. in Phyc. General, 

 232 (1843). Crass, fil. ad has. 8-5-13 /x ; crass, trich. 8-5-9 /u. 



Pungo Andongo. In Batrachospennu (jracilUiiio ad lapides sub- 

 mersas in rivulo de Tangue; ]\Iay 1857. No. 3. 



