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Gen. 21. ST AURA STR UM . Meyen (1829).
Frond more or less deeply constricted at the middle ; segments
broader tban long, often provided with spines or processes,
end view angular or radiate, or circular, with a lobed
radiate margin, or very rarely compressed, with a process at
each extremity.
I. Segments in front view, with each of the opposite lateral
extremities furnished with a mucro, or a simple subulate
acute awn, or spine, which in end view terminates the
angles, and without others intermediate.
* Segments smooth, angles in end view inflated, sides concave.
Stauzastzum d e je c tum . Breh. in Meneg. Syn. Besm. (1810), p. 227.
Segments smooth, lunate, or elliptic; constricted portion very
short, awns projecting upwards ; end view with three or four
inflated awned lobes. Zygospore orbicular, spinous, spines at
first hair-like, afterwards stout and subulate.
S iz e . 25 p. (W.) ; length 24-28 p ; diam. 19-33 p. (K.) ;
diam. 25-38 without spines (Wo.).
Ealfs. Desm. (1848), p. 121, t. 20, flg. 5. Archer in Prit.
Infus. (1861), p. 737. Wittr. Sotv. Alg., p. 54. Cleve Sver.
Desm. (1864), p. 489. Kirchn. Alg. Schles. (1878), p. 168.
Lundell Desm. Suec. (1871), p. 59. Nordstedt Norges Desm.
(1873), p. 27. Petit Liste Desm. Paris (1877), p. 31.
Grunow Desm. Aust. (1858), p. 498. Wittrook Scan. Desm.
(18C9),p. 16. Wood F. Water Alg® U.S. (1872), p. 148.
Wille Norges Desm., p. 40. Notaris Desm. Ital. (1867), p.
55, t. 5, f. 51. Eabb. Alg. Eur. (1868), p. 203. Jacobsen
Desm. Denm. (1874), p. 203, in part. Schaarschm. Magy.
Desm. (1883), p. 27K Brebisson Liste Desm. (1856), p. 142.
Lemaire Desm. Vosg. (1883), p. 22. Nordst. Desm. Gronl.
(1885), p. 10. Wolle Desm. U.S. (1884), p. 121, t. 40, f. 7-
11, 17-21.
Staurastrum mucronatum, ft., Ealfs. Ann. Nat. Hist. (1845),
XV., t. 10, f. 5.
H a b . In ponds.
Surrey, Sussex, Kent, Hants, Cornwall, Norfolk, Gloucester,
Westmoreland, Lancashire, Wales, Ireland, Scotland; France,
Germany, Sweden, Denmark, Norway, Austria, Hungary, Italy,
Greenland, United States.
var. a. lu n a tu m . Balfs. Lesm. (1848), p. 121.
Segments externally lunate, awns directed outwards.
Archerin Prit. Inf. (1861), p. 737.
var. /3. d ir e c tum . Balfs. Lesm. (1848), 121.
Segments elliptic, awns parallel.
Archer in Prit. Inf. (1861), p. 737.
var. 7. m u c r o n a tum . Balfs. Lesm. (1848), p. 121.
Awns converging.
S iz e . Length 27 p; diam. 30 /a(N.).
Goniocystis (Trigonocystis) mucronata, Hass. Fr. Alg. (1845),
p. 350.
Staurastrum dejectum, var y, Rabh. Alg. Eur. (1868), p. 203.
Wolle Desm. U.S. (1884), p. 121, t. 40, f. 8. Archer in Prit.
Inf. (1861), p. 737.
Staurastrum mucronatum, a and y , Ealfs. Ann. Nat, Hist.
(1845), XV., t . 10, f . 5.
Staurastrum mucronatum, Lnndell Desm. Sueo. (1871), p. 59.
Nordstedt Norges Desm. (1873), p. 27. Lemaire Desm. Vosg.
(1883), p. 22. Petit Liste Desm. Paris (1877), p. 31.
Brebisson Liste Desm. (1856), p. 142. Nordst, Desm. Spitz.
(1872), p. 38.
Flate L V ., fig. 7. a, living fronds; h, empty fronds; c d, end
views.
S ta u r a s tr u m a p ic u la tum . Breh. L ist. Lesm. (1856), p. 142.
Segments in front view somewhat turbinate, smooth, opposite
lateral extremities rounded, external margin straight, furnished
at each side, on the upper outer margin, near the lateral
extremities, with a simple short, subulate, acute spine directed
upwards ; end view with three angles, angles inflated, mammil-
late, terminated by a short acute spine, sides concave. Zygospore
orbicular, beset with conical spines, enlarged at the base,
and obtuse at the apex.
S iz e . Length and diam. 18 p (L.).
Archer Micr. Journ. (1868), p. 65. Archer Prit. Inf. (1861),
p. 737.
Staurastrum dejectum var. ft apiculatum. Lundell Desm.
Snec. (1871), p. 59. Wittr. Sotv. Alg. (1872), p. 54.
Nordstedt Norges Desm. (1873), p. 27. Kirchn. Alg. Schles.
(1878), p. 168. Wille Norges Desm., p. 40.
H a b . In ponds.
-Cornwall, Ireland; France, Germany, Sweden, Norway.
Flate X L IX ., fig. 2. a, living fronds ; h, empty fronds; e d, end
views.
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