ri !
: 11
H ab . In stagnant water.
Lake District ; France, Germany, Sweden, Norway, United
States.
Plate X L I I ; fig. 18. a, living frond ; 5, empty frond.
Cosmazium ob liq u um . Nordst. Norg. Desm., 23, t. 1, fi. 8.
Small, about one-quarter longer than broad, rectangular,
constricted in the middle, with a linear sinus ; side view rectangular,
very slightly constricted in the middle ; semi-cells subquadrate,
truncate at the apex, and slightly emarginate ; sides
retuse, end view semi-circular, oblique, one side flat, the other
convex ; cell membrane slightly punctate.
S i z e . Length 23-26 g ; diam. 18-20 g (major) ; 18 X 13 g
(media); 15 x 11 g (minor).
Wille Nova Zembla, p. 39. Wille Norges Desm. (1880),
p. 31. Schaarschm. Magy. Desm. (1882), p. 267.
H ab. In pools.
Scotland ; Norway, Nova Zembla, Hungary.
Plate X L I I I ; fig. 5. a, living frond ; h, empty frond.
Cosmazium læ v e . PahTi. Alg. Pur., in ., 161.
Fronds one and one-third to one and two-thirds longer than
broad, constriction deep ; constriction narrow, linear ; semicells
with high-rounded ends, usually somewhat retuse ; cell
membrane finely granular.
S i z e . Diam. 14-16 g (W.) ; length 20-26 g ; diam. 14-17
g (N. & W.).
Wolle Desm. U.S. (1884), p. 62, t. 15, f. 10. Wille Norges
Desm. (1880), p. 31. Nordst. & Wittr. Desm. Ital. (1876),
p. 28. Schaarsohm. Magy, Desm. (1882), p. 269.
var. se p ten tz io n a le . Wille Nova Zemlla (1879), p. 43, t. 12, / . 34.
A broader form ; semi-cells in side view ovately circular.
S i z e . Length 28 g ; diam. 22 ^ (Wi.).
H ab. On dripping rocks, and in small pools.
Holloway (London), North Wales, Cornwall; France,
Germany, Norway, Italy, Hungary, United States.
Plate X L I I ; fig. 17. a, living frond ; I, c, empty fronds; c, end
view ; d, side view.
Cosmazium ca lca z enm . W ittr. Sottv. Alg., p. 58, t. 4 , / . 13.
Small. Frond but slightly longer than broad, constriction
deep, linear ; segments in front view semi-circular, rather truncate
above, minutely crenulate ; side view ovate, end view
elliptic, swollen in the middle ; empty frond slightly granulate,
with a circular cluster of nine small warts at the base of each
segment (eight in circumference and one in the centre).
S i z e . 19-21 x 17-18 g (Witt.).
Nordst. Norges Desm. (1873), p. 15. Wille Norges Desm.
(1880), p. 28. Archerin Journ. Bot. (1874), iii., p. 93.
H ab. Mountain pools.
Ireland ; Sweden, Norway.
Plate X X X V I I ; fig. 12. a, living frond ; 5, empty frond ; o, side
view ; d, end view.
Cosmazium R e g n e s ii. PeinscTi. Alg. Flora (1867), p . 112, t. 8 ,f. 8.
Small. Cells in front view rectangular, with a median semi-
elliptic incision on each side; semi-cells in front view trapezoid,
denticulate at the margin, with eight equi-distant teeth ; membrane
smooth.
S i z e . Length 11-13 g ; diam. 11-13 g (Re.).
H ab. In mountain pools.
Germany.
Plate X L I I ; fig. 19. a, living frond; b, empty frond; c, same
magn., 1000 diam.
Cosmazium c z en a tum . Ealfs. Ann. Nat. Hist. (1844), xiv., t. 2,
/ . 6 .
Frond minute, not quite twice as long as broad, constriction
linear ; segments obsoletely quadrate, crenate at the margin,
flattened at ends, surface punctate ; end view elliptic. Zygospore
orbicular, spinous ; spines short and stout, swollen at the
base, and divided at the apex.
S i z e . Length 21 g ; diam. 16 g (D.) ; length 53-58 g ;
diam. 88 g (K.) ; diam. 80-38 g (W.).
Euastrum ? sinuosum, Kutz. Sp. Alg. (1849), p. 174.
Cosmarium crenatum, Ralfs. Desm. (1848), t. 15, f. 7.
Archer in Prit. Inf. (1861), p. 732. Nordst. Desm. Gronl.
(1885), p. 8. Delponte Desm. (1878), p. 6 (in part), t. 7, f.
25-27. Nordstedt Desm. Arct. (1875), p. 21, 88. Lnndell
Desm. Suec. (1871), p. 34. Nordstedt Desm. Spitz., p. 29.
Nordstedt Norges Desm. (1873), p. 75. Petit Liste Desm.
Paris (1877), p. 30. Grunow Desm. Austr. (1858), p. 497.
Nordst. * Wittr. Desm. Ital. (1876), p. 85. Wood F. Water
Alg® U.S. (1872), p. 131. Welle Desm. U.S. (1884), p. 67,
t. 49, f. 31, 82. Wille Norges Desm. (1880), p. 28. Schaarschm.
Bosn. Serv. p. 7. Sohaarsobm. Magy. Desm. (1882), p.
265. Wittrook Scan. Desm. (1869), p. 10. Brebisson Liste
Desm. (;i856), p. 127. Notaris Desm. Ital, (1807), p. 47, t.
" iii