158 nematophyoeæ.
I i f
larger and elliptic oogonium; aperture of the oogonium very
high up, being quite close to the annular striæ of the caps.
OEdogonivm PringsJuimianim, Archer, in Quart. Journ.
Micr. Sci., 1868, pp. 295.
Ii-eland.
There being already a speoies bearing the name of OEdogonium
Prings/ieimii, which had priority, it became necessary to alter Mr.
Arohei’a specific name. lYe have moi seen the species, and hence are
unable to furnish a figure. Unfortunately no measurements are given
with the above very brief description, which is a doubtful economy of
space. I t is the only raonoecions species with striate elliptical
oospores.
Section i i . Dioecious speoies.
A. Diva rf males unicellular.
a. Oogonia furnished with verticellate median processes.
OEdogonium p la ty g yn um . Wittr. OEdog. Nov. p. 1.
Gynandrosporous. Oogonia single (very rarely binate), depressedly
obverse egg-shaped, median processes 7-12, rounded;
oogonia cut round (oircuinsoissile) below the middle, opening by
a pore seated in the fissure, vertical view 'orbicular, margin
sinuate, with 7-12 (usually 8) depressions; oospores rather depressedly
globose, nearly filling tbe oogonium, androsporangia
1-3 celled ; terminal cell obtuse. Dwarf males obverse egg-
shaped, small, seated on the oogonia.
S iz e . Cells '006- 01 mm., from 2-5 times as long ; oogonia
'021--03 X '016-'024 mm. ; oospore'017-'024 x '015-'02 mm. ;
androsp. cell '006--008 x '007-'008 mm. ; dwarf males
'0045--005 x '0085--0095 mm.
W ittr. Mon. OEdog. p. 17, t. 1, f. 5-9. Kirch. Alg. Schles.
p. 53.
Ireland.
Plate L IX . fig. 5. (Edvgoniumplatygynum, with oogonium ; a, trans-
verse section of oospore x 400.
b. Oogonia destitute of median processes.
a Oospores globose or subglobose.
OEdogouium R o th ii. {Le Clerc.) Prings. Beitr. 69, t. 5, f. 4.
Gynandrosporous. Oogonia single, or 2-6 continuous, globose,
or rather depressedly globose, opening with a pore a t the
middle. Oospores rather depressedly globose, almost filling the
oogonia. Androsporangia 2-4 celled, subhypogynous ; dwarf
males obversely egg-shaped, seated on the oogonia.
S iz e . Cells '006-'008 mm., 3-8 times as long ; oogonia
•02--021 X ‘Oie-'OIO mm,
cëdogoniaoeÆ. 159
W ittr. Mon. OEdog. p. 18. Kirch. Alg. Schl. p. 53. Kabh.
Alg. Bur. iii. 348.
Vesiculifera Rothii, Hassall, t. 53, f. 7 ?
Prolifera Rothii, Le Clerc Prolif. 476, t. 23, f. 8 ?
Scotland, Ireland, England.
Mr. Archer meutious this plant aa having been found by him with a
chain of as many as eleven oogonia in snooession.—Quart. Micro. Journ.,
1866, p. 69.
Plate L IX . fig 6. OEdogonium Rothii with oogonia, androsporangia, and
dwarf males X 400.
OE d o g o u ium A ie s c h o u g ii. Wittr. Disp. : p . 122.
Gynandrosporous. Oogonia 2-6, continuous or single, rather
depressedly globose, broadly out round (circumscissile) in the
middle, opening by a pore in the fissure. Oospore exactly
globose, not by any means filling the oogonium. Androsporangia
1-6 celled, hypogynous or subepigynous, or rarely
scattered, terminal cell (which sometimes is the androsporangium),
obtuse, dwarf males obversely egg-shaped, seated on the oogonia.
S iz e . Cells '008--012 mm., 4-6 times as long ; Oogonia
'038--039 x '036--04 mm. ; oospore '022--024 x '022--024
mm.; androsp. cells 'O l-'O il X '01-'012 mm.; dwarf males
'006--007 X '014--015 mm.
Archer in Quart. Journ. Micr. Sci. 1872, xii., p. 422. W ittr.
Mon. OEdog. p. 19.
Ireland.
Plato LIX. fig 7. OEdogonium Areschougii with oogonia, audro-
aporangia, and dwarf males X 400—after Wittrock.
OE d o g o u ium p lu v ia le . Nordst. Bah. Alg. Eur. No. 2251.
Idio-androsporous. Oogonia simple, rarely 2-3 continuous,
obversely egg-shaped, globose, or nearly globose, opening by a
terminal operculum, fissure narrow ; oospores nearly globose,
almost filling the oogonium, terminal cell obtuse, filaments
bearing the androsporangia a little slenderer than the female
filaments; androsporangia 6-10 celled; dwarf males broadly
obverse egg-shaped, seated on the oogonia.
S iz e , Cells '018-'028 mm., equal to three times as lo n g ;
oogonia '034-'039 X '034-'045 mm. ; oospore '032-'037x
'03 1 -'0 4 mm, ; androsp. cell '017-'019 X '006-'011 mm. ;
dwarf males '01 x '015 mm.
W ittr. Mon. OEdog. p. 19.
OEdogonium diplandritm, Ju r. Beitr. OEdog. p. 27, t. 1-3.
Vesiculifera dissiliens, Hass. F . W. Alg. 202, t. 50, f. 7.
Plate L IX . fig. 8. OEdogonium pluviale with oogonia and dwarf
male x 400.
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