I ! • i
Lundell Desm. Suec. (1871), p. 65. Nordstedt Norges. Desm.
(1873), p. 32. Schaarschm. Magy. Desm. (1883), p. 274.
Lemaire Desm. Vosg. (1883), p. 23. Brebisson Liste Desm.
(1856), p. 138. Notaris Desm. Ital. (1867), p. 49, t. 6, f. 37.
Eabh. Alg. Eur. (1868), p. 217. Wolle Desm. U.S. (1884),
p. 148, t. 47, f. 5-8.
Desmidium ramosum, Ehr. Mikr. Leb. S. & N. A. (1843),
t. 4, f. 21.
Asteroxanthium ramosum, Kutz. Spec. Alg. (1849), 184.
H ab. In pools.
Sussex, Cornwall, Wales ; France, Germany, Sweden,
Norway, Spitzbergen, Italy, Hungary, United States.
Flate L I I I . , flg. 1. a, living frond; h, empty frond ; c d, end
views.
Stauzastzum Gziffithsianum. (Näg.) Archer in Micr. Journ.
(1866), p. 67.
Of medium size, sub-orbicular, with a narrow sinus, densely
clad and margined with short equal truncate processes, which
are two to four-toothed at the apex. Semi-cells semi-orbicular,
or sub-trapezoid, end view triangular, angles obtuse, sides
concave (destitute of spines at the middle).
Size. 50 x 50 /r without spines.
Nordst. Desm. Gronl. (1885), p. 11.
Phycastrum Grißthsianum, Näg. Einz. Alg. (1849), 127, t.
viii., c. f. 2.
Staurastrum spongiosum, Eabh. Alg. Eur. (1868), p. 217 in
part. Lund. Desm. Suec. (1871), p. 65 in part.
H ab. In pools.
Ireland; Germany, Sweden, Greenland.
Plate L I I I . , fig. 2. a, living frond ; I, empty frond ; c d, end
views.
Stauzastzum aspezum . Breh. in R alfs. Desm. (1848), p . 139, t.
22, / . 6 ; Í. 23, / . 12.
Segments broadly elliptic, rough with minute spines, which,
on the outer margin, are usually dilated a t the end or forked.
Zygospore orbicular, spiny ; spines twice branched at the apex.
Size. Diam. 40-45 p (Wo.) ; length 52 p ; diam. 45 p.
Archer in Prit. Inf. (1861), p. 740. Cleve. Sver. Desm.
(1864), p. 491. Grunow. Desm, Austr. (1858), p. 502. Eabh.
Alg. Eur. (1868), p. 209. Wolle Desm. U.S. (1884), p. 127,
t. 42, f. 7, 8.
H ab. In ponds, &c.
Cornwall, Lake District ; Prance, Sweden, Austria, United
States.
Blate L I I I . , flg. 4. a, living frond; I, empty frond; c d, end views;
e, zygospore.
S tauzastzum m a am en se . Archer Micr. Journ. (1869), ix., p. 200.
Of medium size, one fourth-part longer than broad, sub-oval,
apex sub-trnncate, deeply constricted in the middle, with a very
narrow linear sinus, semi-cells somewhat semi-circular, ventral
margin straight, lateral margin crenate with truncate warts,
dorsal margin obsoletely eroded, inferior angles sub-truncate,
end view triangular, side slightly concave, angles broadly
truncate with three granules.
S iz e . Length, 38-42 p ; diam. 30-35 p (L.).
Nordstedt Norges Desm. (1874), p. 32. Archer in Journ.
Bot. (1874), iii., 93.
Staurastrum pseudocrenatum, Lundell Desm. Sueo. (1871), p.
65, t. 4, f. 4.
H ab. In mountain pools, amongst Myriophyllum.
Ireland, Westmoreland, Scotland ; Sweden, Norway.
Blate L I I I . , fig. 3. a, living frond ; h, empty frond; a d, end
views.
S tauzastzum sa x o n icum . Reinsch. Act. SencTc. (1867), p. 127, t. 24.
c. 1 (not. Bulnh.).
Medium size, about as broad as long. Semi-cells in front
view elliptical, side angles rounded,, obtuse dorsal margin
straight, lateral angles, and above them armed with firm ternate
spines, dorsal margin and within it furnished with shortly truncate
warts ; end view triangular with rounded obtuse, angles,
sides straight or a little convex, furnished with a row of warts,
outer angles armed with firm ternate spines, within the margin
a row of obtuse warts on either side.
Siz e . Length 70-75 p ; diam. 62-67 p (N .) ; length 72-
80 p ; diam. 58-70 p (Wi.) ; length 5 4 /i ; diam. 54 p (Re.).
Nordst. Desm. Spetz. (1872), p. 40. Wille Nova Zemb.
(1879), p. 54. Lemaire Desm. Vosg. (1883), p. 23.
H ab. In pools.
North Wales; Prance, Germany, Nova Zembla, Spitzbergen.
Blate L I I I . , fig 5. a a, living fronds; I S, empty fronds; e <f, end
views.
,'ii
A