LYNGBY, 247 
Oscillaria tenerrima. Kutz. Zab. Phyc. 1, t. 38, f. 8. 
Solitary and scattered, or associated in fascicles. Trichomes 
straight, indistinctly articulate, joints equal in length to their 
diameter, or a little longer or shorter, ends somewhat acute, 
slightly inclined ; cell-contents pale blue green, or olive, homo- 
genous or very finely granular, 
Size. Threads ‘0018-0025 mm. diam. 
Rabh. Alg. Eur. ii., 96. 
In ditches, amongst decaying vegetable matter. 
Plate XCVI. fig. 4. Trichomes X 400. 
Oscillaria leptotricha. Kutz. Tab. Phyc..., t. 38, f. 9. 
Solitary, scattered, or collected in a very thin blue green 
stratum, trichomes very slender, slightly curved, indistinctly 
articulate, joints twice as lony as broad, or after division equal, 
very minutely punctate at the periphery, attenuated at the ends, 
which are straight, curved, or deflexed, cell-contents pale blue, 
green, homogenous or finely granular. 
Size. Threads 003 mm, diam. 
Rabh. Alg. Hur, ii., 97. 
In fresh or brackish ditches. 
Plate XCVI. fig. 5. Trichomes X 400. 
var. splendida. (Grev. Fl. Edin. 304.) 
Size. Trichomes not exceeding ‘002 mm. diam. 
Oscillatoria splendida, Eng. Fl. v., 875. Harv. Man. 164. 
Hass. Alg. 251, t. 72, f. 8. 
In tubs of water in a stove. Edinburgh Botanic Gardens. 
Plate XCVI1. fig. 6. Trichomes X 400. 
Oscillaria spiralis. (arm. Harv. Phye, Britt. t. 105B. 
Effused in a firm coriaceous glossy black stratum. Trichomes 
radiating, slender, long, flexuous, regularly twisted in spirals. 
Size. Threads -0035-:004 mm. diam. 
Spirillum rupestre, Hass. Alg. 277, t. 75, f. 6. 
Spirulina rupestre, Rabh. Alg. Enr. ii, 938. 
On rocks by the seaside. 
‘Jt spreads over the dry naked earth. Stratum several feet in extent, 
firm, coriaceous, of a glossy black colour, void of lubricity. Filaments 
about half a line in length, twisted like a corkscrew, radiating in all di- 
rections.” — Carmichael. 
Plate XCVIII. fig.7. Trichomes X 400, from the original specimens. 
