98 MR. J. GROVES ON CHAROPHYTA 
N. Centr. Prov., 7th Nov. 1895, no. 7; Tirupane, N. Centr. Prov., 9th Nov. 
1895, no. 8; Negumbo, Western Prov. (at sea-level), 15th Nov. 1895, 
no. 9; Tangalla (shallow tank), Southern Prov., 8th Jan. 1898, no. 30; near 
Dikwella (roadside stream), South Prov., 9th Jan. 1898, no. 31. 
Slightly differing forms of this widely-distributed extra-European species. 
The comparative length of the primary rays and dactyls is extremely variable, 
even in specimens of the same gathering. This is particularly noticeable in 
the Anuradhapura plant, the sterile branchlets on some examples of which 
have the extremely short dactyls of the var. Bellangeri (the type of Draun's 
species), while in others the dactyls are half the length of the primary rays ; 
in the Tirupane plant the dactyls are in some cases nearly as long as the 
primary rays. The character would therefore seem to be of little value in 
this species. The Dikwella plant is of more flexible habit than the others, 
due no doubt to the habitat. Oospores measured c. 275-310 u long, c. 250- 
275 u broad, c. 175-225 w thick, antheridia c. 275 a in diameter.  Oogonia 
often clustered, This species was previously collected by Trimen at Galle 
about 1881. 
N. acuminata differs from N. flexilis, Agardh, and N. laxa, Allen, in the 
much smaller antheridia and oogonia, the spiral-cells of the latter not swelling 
at the apex, in the persistent coronula and in the decoration of the oospore- 
membrane, and from the first-named in the conspicuously tapering dactyls 
with long, sharp points. 
NITELLA MUCRONATA, Miquel in van Hall, Fl. Belg. sept. ii. p. 428 (1840) 
sens. lat. 
Botanie Gardens, Peradeniya, Centr. Prov., Nov. 1895, no. 10. 
A single specimen without ripe fruit, which I can only refer to this species 
in a broad sense until further specimens are forthcoming. The dactyls have 
the charaeteristie proportionally narrow apical cells, and are sometimes 
3-celled. The branchlets are 2-3 times forked, gametangia being produced at 
each furcation. The antheridia attain to c. 325 w in diameter. A sterile 
plant from Anuradhapura collected 7th Nov. 1895, No. 24, probably also 
belongs to this species. A form of N. mucronata was previously collected in 
Ceylon by Ferguson. 
N. PSEUDO-FLABELLATA, Braun in Braun & Nordstedt, Fragm. Monogr. 
Charac. (1882) pp. 12 & 54? 
Newera Eliya (at c. 1980 m.), Centr. Prov., Nov. 1895, no. 11. 
Apparently a form of this variable species, or group of species, having the 
branchlets 2-3 times forked, the primary rays of variable length, but some- 
times more than half as long as the entire branchlet, the secondary rays 5-6, 
the tertiary 4-5, of which usually one only is again divided into 3-4 
