123
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Gen. 18. CALOCYLINDRUS. JDe 5«»-,//(1858).
Cells straight, cylindrical, oval, or spindle-shaped; ends
rounded or truncate, central contriotion almost obsolete, or very
shallow; semi-cells without basal inflation, or longitudinal
plication ; chlorophyll parietal or axillary.
* Frond rough.
Calocylindzus c y lin d iic u s . {Ralfs.)
Frond minute, in front view about twice as long as broad,
segments subquadrate, narrower at the junction and gradually
widening upwards, ends truncate, rough all over with pearly
granules somewhat arranged in lines ; end view circular.
S iz e. Length 57 g ; diam. 21 g (D) ; length 40 g ; diam.
24g[K.).
Cosmarium cylindricum, Ralfs. Ann. Nat. Hist. (1844), xiv.,
p. 392, t. 11, f. 1. Ralfs. Desm. (1848), p. 106, t. 17, f. 4,
Archer in Prit. Inf. (1861), p. 734, t. 3, f. 16-17. Hassall
Fr. Alg. (1845), p. 365. Brebisson Liste Desm. (1856), p.
132. Eabh. Alg. Eur. (1868), p. 176. Wille Nov. 8em.
(1879), p. 47. Wille Norges Fers. (1880), p. 36.
Calocylindrus Ralfsii. Kirchn. Alg. Schles. (1878), p. 142.
Wolle Desmi. U.S. (1884), p. 54, t. 12, f. 17.
Fenium Ralfsii, Kutz. Sp. Alg. (1849), p. 167. Delponte
Desm. (1878), p. 90, t. 15, f. 26-28.
H ab. On wet rocks and cliffs.
Sussex, Cornwall, Wales; France, Germany, Norway, Nova
Zembla, Italy, United States.
Flate X L I I I . , fig. 1-4. a, living frond; h c, empty fronds ; d, end view.
Calocylindrus a n n u la tu s . De Bary Conj. (1858), yi. 72,
Frond minute, scarcely twice as long as broad, cylindrical or
subelliptio, sides and broadly rounded ends rough with minute
granules arranged in transverse lines, which give a minutely
denticulate appearance to the margin, except at a very narrow
central circular annular space, where they are absent, thus imparting
a somewhat constricted appearance ; end view circular,
margin minutely granulated.
Siz e . Diam. 20 g (K.) ; length 40-52 g ; diam. 18-22 g
(N. & W.).
Schaarschm. Magy. Desm. (1883), p. 271. Kirchn. Alg.
Schles. (1878), p. 143.
Cosmarium annulatum, Archer Micr. Journ. (1870), p. 92.
Lundell Desm. Suec. (1871), p. 46. Wittr. Norges Fers. (1880),
ii
p. 38. Nordstedt Norges Desm. (1873), p. 23. Nordstedt
Desm. Arct. (1875), p. 30. Nordst. & Wille Desm. Ital.
(1876), p. 42. Wille Nov. Sem. (1879), p. 49. Lemaire
Desm. Vosg. (1883), p. 21. Jacobsen Desm. Denm. (1874),
p. 196.
Dysphinctium annulatum, Nag. Einz. Algen. (1849), p. 110,
t. 6, f. F.
Penium annulatum, Archer in Pritch. Inf. (1861), p. 751.
Cleve Sver. Desm. (1864), p. 493. Rabh. Alg. Eur. (1868),
iii., p. 122.
H ab. In pools, &c.
Ireland, Lake District, Scotland ; France, Germany, Norway,
Sweden, Denmark, Italy, Hungary, Spitzbergen, Nova Zembla.
Plate X L I I I . , fig. 15. a l e , living fronds ; d, empty frond ; e, end
view; f , empty frond further magnified.
Calo cy lin d zu s tu b e r o u la tu s. {Archer)
Frond very minute, constriction very obtuse and shallow ;
segments in front view broadly elliptic, outward margin
bordered by a few very minute opaque tubercles or granules;
end view broadly elliptic.
Siz e . Length 14-24 g ; diam 9-11 g.
Cosmarium tuberculatum, Archer in Micr. Journ. (1862), ii,,
p. 247, t. 12, f. 11-15. Rabh. Alg. Eur. (1868), p. 178.
H ab. In small pools.
Ireland.
Plate X L I I I . , fig 13. a c, living fronds; I d, empty fronds; e, end
view; f , empty frond further magnified.
** Frond smooth.
C a locylindzus oblongus. {Bennett)
Minute, two and a half times as long as broad, with a broad
constriction in the middle, semi-cells elliptical, longer than
broad, equally rounded at the base and the apex. Membrane
smooth.
Siz e . Length 55 g ; diam. 22 g (B.).
Cosmarium sp. Reinsch. Coiit., 82, t. 42, f. 3.
Cosmarium oblongum. Bennett Journ. Roy. Mior. Soc.
(1886), p. 10, t. 1, f. 16.
H ab. In bog pools.
Lake District (England).
Plate X L IV ., fig .8 . a, living frond; S, empty frond after Bennett.
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