ALG^ FROM CENTRAL AFRICA. 381 



SORASTRE^. 



27. CcELASTRUM sPH^RicuM Niig. [C. N(i[/eUi Eabh. Fl. Earop. 

 Alfjar. iii. 79, pro parte.] Mwangadan Eiver, S. of Fuladoga. 



28. C. Moras, nov. sp. (Fig. 4). C. coenobiis sphfcrici?, e 

 cellulis confertis 16 compositis; cellulis globosis verrucosis, verrucis 

 emarginato-truncatis iu toto ambitu cellubie uniuscuj usque 9-10. 

 Diam. cosnob. 35-3G ji ; diam. cell. 9-5-10 /x. Mwangadan River, 

 S. of Fuladoga. 



Tbe nearest species to tbis is C. scahmin Reinscb (Contrib. Flor. 

 Alg. Aq. dulc. Fremont. Bona; Spei, Journ. Linn. Soc. Bot. xvi. 232, 

 pi. vi. fig. 3), from wbicb it differs in the more crowded cells, which 

 are ornamented with more numerous and distinctly emarginate 

 warts. 



Protococcace^. 



29. Glceocystis ampla (Kiltz.) Eabh. Flor. Europ. AUj. iii. 29. 

 Mwangadan Eiver, S. of Fuladoga, 



30. G. RUPESTRis (Lyngb.) Eabh. I. c. 30. Mwangadan Eiver, 

 S. of Fuladoga. 



31. Ehaphidium polymorphum Fresen. var. aciculare (A. Br.) 

 Eabh. I.e. 45. Mwangadan Eiver, S. of Fuladoga. 



32. ScENEDESMUs OBLiQuus (Turp.) Klitz. S. acntuH Meyen; 

 Ealfs, Brit. Desm. 191, tab. 31, fig. 14. Mwangadan Eiver, S. of 

 Fuladoga. 



33. S. quadricauda (Turp.) Breb. ; Ealfs, I.e. 190, tab. 31, 

 fig. 12 a-f. Mwangadan Eiver, S. of Fuladoga. 



Scytonemace.e. 



34. ScYTONEMA sp. Crass. fil. 18-20 /x; crass, trich. 10-11 // ; 

 heterocyst. 10 x 11*5-13 /x. G. Laschan, Leikipia. 



SiROSIPHONIACEiE . 



35. NoSTOcHOPSis LOBATUS Wood, Prodr. Freshw. Alg. N. Amer. 

 127 ; Contrib. Hist. Freshw. Alg. N. Amer., Smithsonian Coutrih. to 

 Knowledge, 44, tab. iii. fig. 6; Bornet et Flahault, Bevis. des Nostoch. 

 Heterocyst. iii. 80. Crass, fil. infer. 2 jx; crass, cell. sup. 3-5-4-5 //; 

 diam. heterocyst. 6-8 /x (Figs. 1-2). Inkuyuni, Kamassia. 



The cells of the plants examined were rather smaller than the 

 average for this species ; all the heterocysts were lateral, and 

 mostly stalked. The figures given by Wille [Didriig til Sgtldinerik. 

 AlgjI. tail. 1, f. 1-19) show much slighter intercellular constrictions, 

 and the branching seems very different to that of the African plant. 



Lyngb YE ^. 



36. OsciLLATORiA LiMosA Ag. [OscHhiria Frfclichii Kiitz. ; O. nigra 

 Ag.] Crass, fil. 15-15-5 /x. Mwangadan Eiver, S. of Fuladoga. 



37. Arthrospira platensis (Nordst.) Gomont, Phonograph, des 

 Oscillar. 2G7, pi. vii. fig. 27. Spiral ina Jenneri Hass. fi. jdatensis 

 Nordst. in Wittr. et Nordst. Alg. Aq. Dale. Exsicc. fascic. xiv. 



