256 NEMATOGENZE. 
Microcoleus terrestris. Desm. Pl. Crypt. Exs.1., No. 55. 
Stratum more or less expanded, deep blue green or steel blue, 
or olive, becoming brownish, membranaceous, mucilaginous ; 
trichomes equal, collected in filiform fascicles, sometimes much 
elongated, extruding from the opening of a common sheath in ‘a 
penicillate manner, joints equal in breadth and length, dissepi- 
ments granulated, apiculus acute, straight. 
Size. Trichomes -005--006 mm.; fascicles -075-08 mm. 
Kirch. Alg. Schl. p. 244. 
Chthonoblastus repens, Kutz. Tab. Phyc. i., t. 54. Rabh. Alg. 
Eur. ii., 132. 
Microcoleus repens, Hass. Alg. 260, t. 70, f. 3. Jenner Tunb. 
Wells 188. Harv. Man. 168. 
Conferva vaginata, Eng. Bot. i., t. 1995. 
Oscillatoria chthonoplastes, var. "p Eng. Fl. v., 373. Mack. 
Hib. 239. 
Vaginaria vulgaris, Gray. Arr, i., 280. 
Vaginaria chthonoplastes, Grev. Fl. Ed. 305. 
On moist naked ground. 
“The frond consists of numerous curled branches diverging from a 
centre in a starry manner, and gradually tapering from a broad base to a 
fine point, containing numerous deep green filaments, which radiate and 
oscillate from the tips, and, on laceration, issue in bundles.”—Harvey. 
Plate XCIX. fig. 2. End of fascicle of trichomes with sheath x 400, 
GENUS 103. INACTIS. Kutz. (1843.) 
Trichomes vaginate, indistinctly articulate, parallel and fasti- 
giate, now and then dichotomous, very densely aggregated and 
agglutinated in a pulvinate thallus. 
«Filaments bundled, erect, growing in small rounded tufts, or in a 
felt-like turf of indefinite extent. Trichomes very slender.” — Zhuret. 
Inactis Cresswelli. TZhur. in Ann. Sci. Nat. (1875) 377. 
Forming convex roundish or oval patches, which become con- 
fluent for several inches ; filaments hyaline, yellowish or greenish 
olive, collected into dense rope-like branching bundles, which 
are fastigiate ; trichomes exceedingly slender, once or twice di- 
vided in a dichotomous manner. 
Size. Trichomes :0025 mm. diam. 
Schizothrix Cresswelli, Harv. Phyc. Britt. t. 160. Rabh. 
Alg. Eur. ii, 268. 
Spreading over the surface of soft sandstone rocks exposed to 
the drip of fresh water. 
