OF THE THIRD TANGANYIKA EXPEDITION, 173 
Genus MICROCOLEUS, Desmaz. 
301. MICROCOLEUS VAGINATUS, (Vauch.) Gomont, in Morot, Journ. de Dot. 
iv. (1890) p. 353 ; Ann. Sei. Nat. 7 sér., Bot. xv. (1892) p. 355. 
Var. MONTICOLA, ( Kütz.) Gomont.—Chthonoblastus monticola, Avitz. 
Crass. trich. 3:6—4 и. 
Nyasa.—On rocks, Nkata Bay (23 June, 1904 ; no. 23). 
Subfam. LYNGBYE®. 
Genus PLECTONEMA, Thur. 
302. PrLEcroxEMA Wot et, Farlow, in Bull. Bussey Inst. (1875) p. 77 ; 
Gomont, 1. c. xvi. (1893) p. 98, t. 1. fig. 1—Lyngbya Wollei, Farlow (1876). 
Grass. fil. 32-52 ш; crass. trich. 27-42 р. 
Tanganyika.—In plankton, off Niamkolo Island (29 July, 1904 ; no. 36), 
Komba Bay (11 Oct. 1904: no. 135), and near Sumbu (13 Oct. 1904; 
no. 138). 
Forma robusta : crass. fil. 60-80 ш; crass. trich. 42—59 р. 
Tanganyika.—Floating and dredged, Komba Bay (10 Oct. 1904; no. 134). 
This stout form was loaded with epiphytes. 
303. PrEcroxEMA ТомлхіхІАХОМ, (Aiitz.) Born. in Bull. Soc. Bot. France, 
xxxvi. (1889) p. 155 in obs. ; Gomont, l. c. p. 99. 
Grass. fil. 18-23 p ; crass. trich. 15-17 p. 
Tanganyika.— With the preceding species (no. 134). 
Genus LYNGBYA, C. Ay. 
304. LYNGBYA PUTEALIS, Montagne, т Ann. Sei. Nat. sér. 2, Bot. xiii. 
(1840) p. #00; Gomont, l. c. p. 143, t. 3. fig. 14. 
Crass. fil. 9°5-10°2 и; crass. trich. 7-78 p. 
Tanganyika.—On shells, dredged in about 10 fathoms, Pemba (23 Nov. 
1904 : no. 174). 
305. LYNGBYA MARTENSIANA, Meneghini, Consp. Alg. Eugan. (1837) p. 12; 
Gomont, l. е. р. 145, t. 3. fig. 17.—Oscillatoria turfosa, Carm. (1841). 
Crass. fil. 8 р; crass. trich. 6 р. 
Tanganyika.—On rocks in shallow water, Mbete (29 Sept. 1904 ; no. 114). 
306. Lvxanva VERSICOLOR, ( Wartm.) Gomont, l. c. p. 147, t. 4. figs. 4, о, 
Crass. fil. 38-45 p ; crass. trich. 2°8-3°3 д. 
Nyasa.—On rocks, Nkata Вау (23 June, 1904 ; no. 23). Amongst various 
Algæ scraped from bottom of ss. ' Guendolen? at anchor 8. end off lake 
(15 June, 1904 ; no. 577). 
