OF THE THIRD TANGANYIKA EXPEDITION. 183 
ibus ; heterocystis basilaribus, singulis, binis vel ternis, globosis, late ellipticis 
vel oblongis. 
irass. trich. ad bas. 7-9°5 р; diam. heterocyst. 82-124 р. 
Tanganyika.—Floating in Mtondwe Bay, Niamkolo (13 Aug. 1904; 
no. 66). 
Forma juvenalis ? 
G. thallo minuto subgloboso 170-230 р lato molle et solido ; trichomatibus 
olivaceis viridibus, curtis, in pilum brevem attenuatis ; cellulis basin versus 
subrectangularibus (diametro 14—14-plo longioribus) levissime tumidis, superi- 
oribus diametro usque 5-plo longioribus, valde granulosis ; heterocystis basi- 
laribus globosis ; sporis ignotis. 
Crass. trich. ad bas. 3-3:4 p ; crass. heterocyst. 5"5-6 p. 
Victoria Nyanza.— Among Utricularia, near Entebbe (1 May, 1905; 
no. 620). | 
343. GLGOTRICHIA LONGIARTICULATA, sp. п. (Pl. 10. fig. 5.) 
G. thallo parvo subgloboso molle 750-900 ш lato ; filis subconfertis, 
pressione facile secedentibus ; trichomatibus lete sruginosis, in pilum sub- 
longum attenuatis, inter cellulas distincte constrietis ; cellulis cylindricis, ad 
basin plerumque elongatis, diametro 3-7-plo longioribus (rare 14-plo longi- 
oribus), superioribus заре brevioribus (diametro 3—5-plo longioribus), non- 
nunquam granulo magno conspicuo ad polum unumquemque et cum granulis 
minutis numerosis ; heterocystis basilaribus, magnis, globosis vel late ellip- 
ticis (rare oblongis) ; sporis breviter cylindricis, diametro 3-plo longioribus, 
polis rotundatis, episporio duplicato glabro et lutescente. 
Crass. trich. ad bas. 45-55 ш; crass. heterocyst. 8-9*5 ш; long. spor. 36- 
44 p ; lat. spor. 1275-15 p. 
Nyasa.—Floating in Anchorage Bay (10 June, 1904 ; no. 1). 
This species is nearest to Glæotrichia indica, Schmidle (in Hedwigia, xxxix. 
(1900) p. 174, t. 9. figs. 18, 19), from which it differs in the shorter filaments, 
in the absence of swollen cells next the heterocyst at the base of the trichome. 
and in the smooth outer coat of the spore. The spores are also shorter and 
the heterocysts more rounded. 
There are well-marked constrictions between the cells, and the large 
granule (gas-vacuole ?) at each pole is particularly conspicuous in the more 
elongated cells. The heterocysts are mostly of a broadly-elliptie shape and 
are markedly wider than the trichomes. 
G. longiarticulata differs from G. echinulata ( Conferva echinulata, Sm., 
Engl. Bot. t. 1878; Rivularia echinulata, Turn. ex Sm. l. c. in obs.), 
P. Richter (vide J. Schmidt, in Bot. Tidsskr. xxii. (1899) p. 401), in the 
narrower trichomes, with much longer cells, and in the shorter spores. 
