i
F
iii.r
T e tia sp o r a b u llo sa . Ag. Sp. Alg. p. 414.
Thalhis membranaceous, saccate, obovate, sinuate, bullose,
an inch to a palm long, dark green, more or less verrucose ;
cells nearly sphærioal (after division hemisphærioal or angular),
geminate, or quaternate, crowded, granular.
S i z e . Cells before division '008-’012 mm., after division
•0058--0075 mm. (Rabh.).
Rabh. Alg. iii. 39. Rabh. Exs. No. 115, 1233. Kirch.
Alg. Schl. p. 108.
Monotrema bullosum, Thur. Mem. Oherb. 1854.
Tetraspora minima, Desv. Flor. Ang. p. 17.
Ulva bullosa, Roth. Oat. iii. 320. Hook. Brit. FI. ii. 312.
Harv. Man. p. 171. Hass. Alg. t. 78, f. 13. Dickie Bot.
Guide, p. 306. Eng. Bot. ed. 2, t. 2405.
Stagnant pools and ditches of freshwa te r.
Plate VI. Jig. 1. a, natural size ; b, fragment mag. 400 diam,
Tetxaspoza g e la tin o sa . {Vauch.)
Thallus vesiculose, ovate-olavate, or obovate, gelatinous, with
age unequally expanded, irregularly torn, pallid and sometimes
dirty-green, often inornsted with lime ; cells of variable size,
globose, either single or geminate, and scattered or quaternate,
or gemmate, and somewhat crowded ; contents green and
granular.
S i z e . Cells •003-'014 mm. (Rabh.).
Eabh. Alg. iii. 40. Hook, Br. Flor. ii. 313. Maokay Flor.
Hiber. p. 244. Hass. Alg. p. 301. Kirch. Alg. Schl. p. 109.
Ulva gelatinosa, Vauch. Hist. p. 244, t. 17, f. 2.
Rivularia tubulosa, DC. FI. Fr. ii. p. 5.
In pools and ditches.
Plate VI. Jig. 2. a, natural size ; b, fragment mag. 400 diam.
Tetxaspoxa lubxica. (Poth.)
Thallus elongated, tubular, erect, an inch to a palm long, 1-4
lines thick, splitting, undulate, sinuous, sticky, between gelatinous
and membranaceous, yellow-green ; cells globose, or
rather angular, of medium size, green ; tegmment very thin.
S iz e . Cells 'OOS-'Ol mm. (Rabh.).
Eabh. Alg. iii. 41. Eabh. Exs. No. 51. Dickie Bot. Guide,
p. 306. Eng. Bot ed. 2, t. 2407. Hass. Alg. p. 300, t. 78, f.
10. Kirch. Alg. Schl. p. 109.
Tetrasporella lubrica, Gaill. Desm. Ex. i. 655.
Ulva lubrica, Roth. Cat, i. 204.
Conferva lubrica, Roth. Cat. iii. 168.
Plate VI. Jig. 3. a, natural size ; b, fragment mag. 400 diam.
Tetxaspoxa flava. Hass. Alg. t. 78, f . 11.
Thallus yellow when dry, cellules small, quaternate.
Rabh. Alg. iii. p. 42.
In rocky rivulets.
“ This species, at all events, would appear to be distinot, the cells
being two to three times smaller than those of T. lubrica and T. gela-
tinosa.”—Hassall.
This is a doubtful species, which no one but Hassall appears to have
seen.
Plate VI. Jig. 4. Fragment magnified, after Hassall.
G en u s 11. BOTK.YOCOCCUS. Kutz. (1849.)
Thallus botryoid (or like a bunch of grapes), irregularly
lobed, mucous, involved in a thin parent membrane (?). Cells
ovoid or elliptic, united in families, which are densely packed
within a thin diffluent tegument.
Represented in Europe by a single species.
Botxyococcus Bxaunii. Kutz. sp. 802.
Small, free swimming, green, at length becoming pallid or
reddish-brown.
S i z e . Cells '01--0125 mm. (Rabh.).
Rabh. Alg. iii. 43. Pres, in Abh. Senk. t. ii. f. 27-83.
Archer Micr. Journ., 1870, p. 88. Kirch. Alg. Schl. p. 111.
In moor pools.
Specimens were found by Dr. Moore floating on the surface of Lough
Bray in long sheets of some yards in length. Mr. Archer remarked
upon these “ that this was not an uncommon alga in moor pools, sometimes
coating submerged sedges, and the like, with a greyish green
stratum, sometimes, however, suspended in the water in streaks, and
often isolated. It passes through a red condition. More than once,
when a single group or family of this alga, from gatherings kept for
some time in the house, had turned up under a low power of the
microscope, he had been to some extent deceived by the way in which it
resembles some racliolarian rhizopod, strange as it may seem. The
mucous matrix containing the families of cells seems not unfreqnently
to give off rather long, filiform prolongations, which stand out more or
less radiantly, looking not unlike pseudopodia and these are undoubted
rhizopoda containing chlorophyll. I t might, indeed, be a good example
of two objects with no affinity in any respect to each other, still superficially
simulating one another.”—Micro. Journ., 1870, p. 88.
Plate VII. Jig. 2. a, family group ; h, single family j c, undergoing
segmentation ; d, free mature cells. All magnified 400 diameters.
Genus 12. APIOCYSTIS. Nag. (1849.)
Thallus small, vesicular, fixed by a stem-like base. Cells
globose, scattered, or sometimes 8 disposed in a circle ; contents
homogenous, or delicately granulose, with a distinct colourless
vacuole ; tegument thick, dissolving into a homogenous gelatine,
cells dividing alternately in all directions. Propagation by
mobile gonidia, wliich are globose, and furnished with a pair of
vibratile cilia.
This genus consists of a siiigle species, unless the variety linearis of
Nageli is entitled to rank as specifically distinct.
B