38 ZYOOPHYOBAE. d e s m id ie a :. 39
Gbnub9. PENHTM. JBre5. (1848).
Frond elongate, straight, cylindrical, elliptic, or lanceolate,
either not at all constricted, or but very slightly narrowed
at the middle, entire. Endochrome with or without a terminal
clear space, containing active granules.— Archer in Pritch.
Infus. 750.
A. Empty frond granulate.
P e n iu m m a x g a x ita c e um . Breb. in Ralfs. Lesm., p . 149, t .2 5 ,f. 1.
Frond six to ten times as long as broad, fusiform or
cylindrical, with rounded-truncate ends, rough with pearly
granules arranged in longitudinal lines. Endoohrome at each
end sometimes with a more or less distinct terminal cavity with
active granules. Zygospore orbicular, smooth.
S i z e . Length 225 p ; diam. 24-28 p (W .); length
115-136 u; diam. 22-25 g (D.); diam. 24-28 g (K.).
Breb. Liste Desm. (1856), p. 146. Archer in Prit. Inf.
(1861), p. 750. Delponte Desm. (1878), t. 15, f. 43-50.
Notaris Desm. Ital. (1867), t. 8, f. 79. Cleve Sver. Desm.
(1864), p. 493. Lundell Desm. Sueo. (1871), p. 85. Nordstedt
Norges Desm. (1873), p. 44. Wood Alg® U.S. (1872), p.
107. Klebs. Desm. Pruss. (1879), p. 21. Rabh. Alg. Eur.
(1868), p. 121. Nordstedt Desm. Spitz. (1872), p. 25. Wolle.
Desm. U.S. (1884), p. 34, t. 5, f. 5, 6, 11. Kirch. Alg.
Schles. (1878), p. 135.
Glosterium margaritaceum, Ehr. Inf. (1838), t. 6, f. 13.
Hassall Fr. Alg. (1845), p. 376.
H ab. In pools, &c.
Great Britain; France, Germany, Italy, Sweden, Norway,
United States, New Zealand.
Plate X V I I ., fig. a c e, living fronds •, b d fi, empty fronds ¡ g,
zygospore.
var. a. Archer in Pritch. Infus., p. 750, t. 2, / . 14.
Frond fusiform, gradually constricted at the middle, grannies
distinct.
Sussex, Cornwall.
var ¡3. Balfs. Desm., p. 149, t. 3 3 ,/. 3.
Frond linear, scarcely contracted at the middle, granules
distinct.
Sussex, Gloucester.
var. y. p u n c t a tu m . Ralfs. Lesm.p. 149, t. 2 5 ,/. 1.
Frond linear, not contracted at the middle, granules appearing
like puncta.
Sussex, Surrey, Westmoreland, Wales, Scotland.
Plate X V I I ,, fig. 1. h, empty frond of this variety.
P e n ium c y iin d x u s . Breb. in Ralfs. Lesm. p . 150, t. 2 5 ,/. 2.
Frond minute, reddish, three or four times as long as broad,
cylindrical, not contracted at the middle, ends rounded-truncate,
rough with minute, closely scattered, pearly granules. Empty
frond red ; zygospore globose, smooth.
S i z e . Diam. 13-20 p ; zygospore 20 p (K .) ; length
50-57 p ) diam. 25 p (D.).
Breb. Liste Desm. (1856), p. 146. Archer in Prit. Inf.
(1861), p. 750. Delponte Desm. (1878), t. 15, f. 29-33.
Lundell Desm. Sueo. (1871), p. 85. Nordstedt Norges Desm.
(1873), p. I I . Petit Liste Desm. Paris (1877), p. 28.
Grunow Desm. Austr. (1858), p. 501. Notaris Desm. Ital.
(1867), p. 70, t. 8, f. 81. Rabh. Alg. Eur. (1868), p. 122.
Glosterium cylindrus, Ehr. Infus. (1838), t. 6, f. 6. Kutz.
Phy. Germ., p. 132.
Dysphinctium cylindrus, Nag. Einz. Alg. (1849), p. 111.
Galocylindrus cylindrus, Kirch. Alg. Sohl. (1878), p. 142.
H ab. In ponds.
Sussex, Westmoreland, Cornwall, Wales ; France, Germany,
Italy, Sweden, Norway, Austria.
Plate X V I I ., fig. 2. a a, living fronds; b, empty frond.
B. Empty frond striate.
P e n ium sp ix o s tx io la tum . Barker in Micr. Journ. (1869), ix.,
p. 194.
Rather large, elongated, somewhat attenuated at the centre,
and tapering slightly towards the rotnndato-trunoate ends.
Cell membrane with a number of rather coarse stri®, running
in a spiral direction, these somewhat interrupted at a number
of annular rib-like projections, which are most numerous
towards the upper third of the segment.
S i z e . Length 155-225 p ; diam. 17-23 p (N.).
Wittrock and Nordstedt Alg® Exsio., No. 574.
Glosterium spiraliferum, Jacobs. Desm. Denm., t. 7, f. 8.
H ab. In pools, &c.
Ireland, Denmark, Sweden.
Plate X V ., fiy. 9. a, living fronds ; b b, empty fronds.
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