it
f t
J
282 n bm a t o g b n e a :.
Gloiotrichia. p isum . Thur. Ann. des Sci. Nat. 1875, 377.
Of the size and form of a pea, sometimes as large as a cherry,
soft, even, or a little warted, dark olive-green, or brownish, tr ichomes
elongated; the lower part blue-green, distinctly articulated,
the upper part setiform, colourless, and indistinctly a rticulated,
lower joints about equal in length and breadth, here
and there somewhat swollen ; heterocysts globose or subglobose.
S iz e . Trichomes -01--012 mm. diam. at base. Spores -01-
•0 1 2 mm. diam., of variable length.
Kirch. Alg. Schles. 222.
Rivularia pisum, Ag. Syst., p. 25. Eabh. Alg. Eur. i. 206.
Berk. Glean, t. 1 1 , f. 2. Eng. Fl. v., 392. Harv. Man. 150.
Mack. Hib. 285.
Linkia dura, Grev. Fl. Ed. 822. Johnst. Fl. Berw. ii., 261.
Physactis pisum, Kutz. Tab. Phyc. ii., t. 60, f. 3.
In ponds, ditches, &c., adhering to aquatic plants.
Plate XGYI. fig. 2. a, plants natural size; i. tricliomes of the same
X 400 diam.
C lass I I I . E H O D O PH Y C E H li (or F loridb,b ).
Multicellular Alg®, with terminal vegetation. Thallns composed
of a series of cells, either singly or disposed in strata,
which are naked or corticate, of variable form, membranaceous,
crustaceous, filamentose, vertically branched, fasciculate, foliaceous,
&c. Cell contents for the most p a rt reddish, rarely
otherwise coloured. Reproductive organs of three kinds, very
often disposed in different plants, viz. ( 1 ) Male organs, or antheridia
; (2), Female organs, or cystooarps ; and (3 ), Tetra-
sporangia.
F o r the most pa rt marine.
F a m i l y I. PORPHYRAOE^.
Thallus mucous-membranaceous, foliaceous or filamentose,
formed from a single stratum of cells, chiefly purplish. Vegetation
by division of cells in two or more directions. Propagation
by tetraspores.
Genus 117. B A N G IA . Lyngb. (1819.)
Thallus filamentous, terete or flattened, nearly plane, simple
or branched, for the most pa rt purplish, lubricóse, formed from
a single series of cells. Cell membrane thick, colourless, sometimes
lamellose. Multiplication by the repeated division of the
cell-oontents in all directions.
c h a n t b a n s ia o b a s . 283
Bangia atro-purpurea. (Dillw.) Ag. Syst. p. 76.
Forming lax purple tufts ; threads abbreviated, scarcely exceeding
an inch long, simple, varying in thickness according to
age, joints nearly eqnal in length to their diameter, or one-third
as long, more or less constricted at the joints.
S iz e . Filaments •03-'06 mm. diam. Cells '01 mm. long.
Eabh. Alg. Eur. i., 398. Eng. Bot. ii., t. 2413.
Conferva atro-purpurea, Dillw. Conf., t. 103. Eng. Bot. i., t.
2085.
Girardia fusco-purpurea, ft. Gray Arr. i., 287.
Attached to wood and stones in streams.
In his most recent work Agardh advocates the removal of this genus
to the Ulvacew, on account of the absence of genuine tetraspores.
Plate C X V II. fig. 1. a, portion of tuft, natural size j b, portions of
threads X 400 diam.
F a m i l y II. CHANTRANSIACE./i].
Forming dwarf pulvinate tufts, of a purplish-violet or steel-
blue colour. Thallus filamentous. Threads articulate, formed
of a single series of cells, branched, straight, naked, fasoioulately
branched above, joints cylindrical. Propagation by immovable
spores formed at the tips of the branchlets. Tetraspores rarely
observed.
G e n u s 118. CHANTB.ANSIA. Fries. (1826.)
The only genus in th e family, with the same characters as
given above.
Chantzansia v io la c e a . Kutz. Tah. Phyc. v. i. 4 4 ,/. 2.
Tufts bright violet, scarcely exceeding a line broad, pulvi-
nately rounded, threads straight, branches becoming erect,
radiately disposed ; joints 8-6 times as long as broad, the apical
joints rather obtuse.
S iz e . Cells -008--009 mm. diam.
Rabh. Alg. Enr. iii., 402. Kiroh. Alg. Schles. 47.
Parasitic on Lemanea, Cladophora, and aquatic mosses.
Plate CXFlll. fig. 1. a, tuft natural size ; b, portions of filaments X
300 diam.