OF THE THIRD TANGANYIKA EXPEDITION. 103 
16. CLADOPHORA INCONSPICUA, sp. n. 
C. pallide viridis, minuta, calce partim incrustata, in lapidibus litoris erosis ; 
cespitibus 1-8 mm. alta, valde et dichotome ramosa, ramis sursum subdicho- 
tome ramulosis, ramis et ramulis plerumque crassitudine equalibus, insertione 
ramorum laterali vel apicali; cellulis (fil. prim., ramorum, et ramulorum) 
diametro 34-84-plo longioribus; cellula apicali ramorum mucronata ; mem- 
brana firma et subcrassa. 
Crass. fil. prim. 50-56 p; crass. ram. et гати]. 18—40 ш; crass. ramul. ult. 
12-15 p. 
Tanganyika.—On stones, dredged in a few fathoms, Niamkolo. 
The pebbles on which this Cladophora was growing were coated with a 
deposit of lime about 4—5 mm. in thickness, the surface of which was much 
eroded, and the minute tufts of the Alga occupied the numerous irregular 
depressions and holes covering the exposed surface of the incrustation. The 
pebbles were of a flinty nature, consisting of dark-coloured impure silica, and 
the outer incrustation of lime containing the hollows was of a brownish-yellow 
colour and much pitted. The actual thallus of the Cladophora is not incrusted 
with lime except at the extreme basal portions. The pebbles presented much 
the same appearance as those described by Chodat from the lakes of the 
Jura. 
Cladophora inconspicua is probably the smallest described species of the 
genus. The thallus is much branched, the branching being mostly dicho- 
tomous. The tufts are very dense, and the basal part of the thallus is firmly 
attached to the stone by colourless rhizoids, which frequently branch and 
become somewhat irregular in outline. Some of the branches of the first 
order terminate in cylindrical apical cells with a mucronate apex, whereas the 
apical cells of the smaller branches are generally narrower and considerably 
attenuated to a blunt extremity. 
Among the basal portions of the Cladophora, in the eroded cavities of the 
stones, were numerous thallitof Palmophyllum jfoliaceum, sp. n., and attached 
to the branches of the Cladophora, especially the younger ones, were quantities 
of Calothriz brevissima forma. 
17. CLADOPHORA sp. 
C. filis di(vel 3—4)-chotoma, ramosissima, ad 6 mm. altis, ramulis 
brevibus et fasciculatis, articulis diametro 3—7-plo longioribus. 
Crass. fil. prim. usque ad 130 ш; crass. ram. 24-34 p. 
Tanganyika.—Growing on stones, shells, submerged roots and grasses, 
Niamkolo (1 Aug. 1904; по. 44). Probably the same plant but less branched, 
with quantities of sand among the branches, attached to shells dredged in 
about 10 fathoms, Mtondwe Bay (2 Sept. 1904 ; no. 83). 
