LYNGBY. 251 
Filaments a line or two in length, variously curved and radiating ; 
strie at.the distance of a diameter from each other.”—Carmichael. 
Plate XCVIII. fig. 8. Portions of trichomes X 400, from the 
original specimens. 
Oscillaria subuliformis, TZhw. in Harv. Phyc. Britt. 
* Stratum of an intense eruginous green. Trichomes bright 
green, subuliform, gradually attenuated towards the apices, which 
are subacute and much curved ; joints about three-fourths as 
long as broad, homogenous. 
Sizz. Trichomes -006-007 mm. diam. 
Hary. Phyc. Britt. t. 251 8. Rabh. Alg. Eur. ii., 292. 
In brackish ditches. Summer and autumn. 
Very bright emerald green, and certainly an attractive species. 
Plate XCVIII. fig. 3. Trichomes from original specimen X 400 
diam. 
Oscillaria limosa. Ag. Syst. Alg. 66. 
Trichomes rigid, straight, actively oscillating, blue-green, 
interwoven in a thin mucilaginous radiating green stratum, 
distinctly articulate, joints nearly equal or a little longer than 
broad (shorter after division, often half as long as the dia- 
meter), dissepiments granulated, apex obtuse, straight or 
curved ; cell-contents pallid, homogenous or slightly granular. 
Sizz. Threads ‘008-01 mm. diam. 
Rabh. Alg. Eur. i., 104. Hook. Br. Fl, ii., 374. 
Conferva limosa, Fl. Dan. t. 1549. 
Oscillatoria limosa, Hass. Alg. 246, t. 71, f. 2.(?) Eng. Fl. 
v., 874. Gray. Arr. i, 280. Eng. Bot. ii., 186. Harv. Man. 
162. Johnst. Fl. Berw. ii., 265. Mack. Hib. 239. FI. Dev. 
ii, 56. 
Oscillaria tenuis d. limosa, Kirch. Alg. Schles. p. 247. 
There are several varieties, differing chiefly in colour, of which Raben- 
horst enumerates ten. 
If Hassall’s figure is magnified in proportion to the rest, then his t. 71, 
f, 2, can scarcely be the present species, for its diameter would be equal 
to that of O. Frolichi?, whereas this scarcely exceeds half that thickness. 
All the figures of Oscillaria given in Hassall’s work are acknowledged to 
be very defective. 
Plate XCVII. fig.3. Portions of trichomes X 400. Fig. 4, portions 
of trichomes of the variety chalyltea X 400. 
Oscillaria irrigua. Kutz. Phyc. Gen. 189. 
. Stratum thin, expanded, compact, dark steel-blue, by oblique 
light purplish violet; trichomes straight, flexile, pallid then 
livid steel blue, a little attenuated at the apex, joints equal in 
length to their diameter (after division half as long) dissepi~ 
2N 
