p. 137. Rabh. Alg. Eur. (1868), p. 204. Schaarschm.
Magy. Desm. (1883), p. 272. Lemaire Desm. Vosg. (1883),
p. 23. Nordst. Desm. Bras. (1869), p. 226. Kirchu. Alg.
Schles. (1878), p. 170. Wolle Desm. U.S. (1884), p. 123,
t. 40, f. 30-32.
H ab. I u p o n d s , &c.
Cornwall, Lake D is tric t; France, Sweden, Norway, Italy,
Hungary, Brazil, United States.
Flate L., fig. 9. a, living frond; J, empty frond; e d, end view ;
e, pair of fronds.
Stauzastzum fu z ea tum . (E h r ) Fritch. Infus. ()86\), p . 143.
Segments smooth, in front view broadly elliptic, furnished
a t each opposite lateral extremity w ith a colourless bifid process,
and with six others similar and divergent on external
margin (four only of which are usually visible) ; end view
with three acnte angles, each tapering into a terminal process,
and each hearing two others on th e upper surface,
placed to each side, and projecting laterally. Zygospore
orbicular, armed witb bifid spines.
S iz e . Length 30 p ; diam. 37-40 p (K.).
Breh. Liste Desm. (1856), p. 136. Rahh. Alg. Eur. (1868),
). 218, in part. Lnndell Desm. Suec. (1871), p. 66. Nordst.
Norges Desm. (1873), p. 33. Jacobsen Desm. Denm. (1874),
p. 209. Schaarsohm. Magy. Desm. (1882), p. 295. Kirchn.
Alg. Sohles. (1878), p. 170.
Xanthidium furcatum, Ehr. Ahh. (1833), p. 318.
Asteroxanthium furcatum, Kutz. Sp. Alg. (1849), p. 182.
Hab. In ponds, &o.
France, Germany, Sweden, Norway, Denmark, Hungary.
var. a zm ig e zum . Freh. in Pritch. Infus. (1861), p . 738.
Segments furnished w ith a few bifid spines, lateral spines
solitary, larger and more fo rk e d ; end view triangular, with
two or three spines on each side and one terminating each
angle.
S iz e. 35 X 35 p.
P e tit Liste Desm. Par. (1877), p. 31.
Staurastrum spinosum, Ralfs. Desm. (1848), p. 143, t. 22,
f. 8. Mask. N. Zeal. Desm. (1882), p. 244.
H a b . In ponds, &c.
Surrey, Westmoreland, Cornwall, Wales; Prance, New
Zealand.
Plate L I., fig. 1. a a, living fronds; h, empty frond ; c c, end viewa ;
d, zygospore.
var. candianum. Delponte Desm. Ita l. (1878).
Size. About 48 X 40 p.
Staurastrum candianum, Delponte, loc. cit.
H a b . In pools.
No rth Wales, Italy.
Plate D i l i . , fig. 6. a, living frond; I, empty fro n d ; c d, end views.
Stauzastzum p seu d o -fu z c ig e zum . Eeinsoh. A Ig. El. (1867), p. 169,
t. 11, fig. 2.
Frond smooth, semi-oells broadly elliptic, sides produced
into a short stout process, with margins smooth and apices
b ifu rc a te ; end view triangular, one process a t each angle,
and two near th e margin of each side, extending beyond it,
making nine processes to each semi-cell.
S iz e . Diam 37-40 p (Wo.) ; length, without spines, 42-46
p ; diam. 38-43 p ; spines 13-15 p long (E.) ; length, without
spines, 37-65 p ; diam. 34-48 p (L.).
Wolle Desm. U.S. (1884), p. 147, t. 52, f. 27-28. Lundell
Desm. Sneo. (1871), p. 71. Nordst. Norges Desm. (1873),
p. 36. W ittr. Sottv. Alg. (1872), p. 50. Wille Norges Fers.
(1880), p. 46.
Staurastrum furcatum o. pseudo-furcigerum, Rabh. Alg,
Eur. (1868), p. 218.
H a b . In ponds and pools.
North Wales ; Germany, Norway, Sweden, United States.
Plate L X I ., fig . 4. a a, living fronds; J 5, empty fronds ; c if, end
views.
Stauzastzum m o n ticu lo sum .
PF
rel. in Meneg. Syn. Desm. (1840),
226.
Segments in front view broadly elliptic, smooth, with a forked
spine on each side, and at the end about four short, acute projections
; end view acutely triangular, with a bifid appendage to
each angle, sides concave.
S iz e . Length 34 p ; diam. 37 p ; with spines 43 p (L.) ;
length 33-35 p ; diam. 38 p (Wo.).
Archer in Prit. Inf. (1861), p. 738. Nat. Hist. Rev. (1858).
t■I Iril
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