LYNGBY^E. 251 



Filaments a line or two in length, variously curved and radiating j 

 strias at the distance of a diameter from each other." Carmichael. 



Plate XCVII1. fig. 8. Portions of triohomes X 400, from the 

 original specimens. 



Oscillaxia subuliformis. Thw. in Harv. PJiyc. Britt. 



Stratum of an intense eeruginous 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. 



SIZE. Trichomes -006-' 007 mm. diam. 



Harv. Phyc. Britt. t. 251 B. Eabh. Alg. Eur. ii., 292. 



In brackish ditches. Summer and autumn. 

 Very bright emerald green, and certainly an attractive species. 



Plate XCV1II. fig. 3. Trichomes from original specimen X 400 

 diam. 



Oscillaxia 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. 



SIZE. Threads f 008-'01 mm. diam. 



Eabh. 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., 374. Gray. Arr. i., 280. Eng. Bot. ii., 186. Harv. Man. 

 162. Johnst. Fl. Bervv. ii., 265. Mack. Hib. 239. Fl. Dev. 

 ii., 56. 



Oscillaria tennis 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 0. Frolichii, whereas this scarcely exceeds half that thickness. 

 All the figures of Oscillaria given in Hassall's work are acknowledged to 

 be very defective. 



Plate XC VII. fig. 3. Portions of trichomes X 400. Fig. 4, portions 

 of trichomes of the variety ckalybea X 400. 



Oscillaxia ixxigua. 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- 



2 N 



