40 ZYGOPHYOBA!.
F e n ium p h ym a to s p o ium . Nordst. Lesm. et (Edog., t. xii., f . 1.
Small, about two and a quarter times as long as broad,
snbcylindrical, scarcely, or not, constricted in the middle;
slightly attenuated from the middle to the rounded truncate
apices; membrane very delicately longitudinally striate.
Amylaceous nucleus single; zygospore rectangular or sub-
qnadrate, the obtuse angles protruding ; apices and sides concave,
at the middle on each side a rounded tumour, and four
tnbercles in the centre ; membrane thick.
SizB. Length 28-32 /x; diam. 14-17 p-, zygospore 36-
42 X 40-36 p (N.).
Joshua Journ. Bot. (1885), p. 35, t. 254, f. 11.
H ab. In pools.
Minety (Wilts) ; Italy.
Plate X V I I . , fig . 8. a a, living fronds ; h, empty frond ; c, zygospore.
G. Empty frond smooth.
F e n iu m d ig itu s . Preb. in Ralfs, Lesm.,p. 151, t. 2 o ,f. 3.
Frond large, stout, smooth, three or four times as long as
broad, elliptic-oblong, sides and ends broadly rounded ; endochrome
in obscure and undulated fillets, interrupted only by the
pale central transverse band, and leaving a clear space at the -
extremities.
S iz e . Diam. 60-80 p (W .); le n g th 300-400 p -, diam. 60-
82 p (K .) ; le n g th 360 p ; diam. 100 p (D.).
Brebisson Liste Desm. (1856), p. 145. Archer in Prit. Inf.
(1861), p. 751. Delponte Desm. (1878), t. 15, f. 50-51
Oleve Sver. Desm. (1864), p. 493. Klebs. Desm. Pruss.
(1879), p. 24. Lundell Desm. Sueo. (1871), p. 84 ; Nordstedt
Norges Desm. (1873), p. 43. Nordstedt Desm. Arct. (1875),
p. 39. Petit Liste Desm. Paris (1877), p. 27. Wolle Desm.
li.S , (1884), 34, t. 5, f. 1, 2, t. 53, f. 1. Kirch. Alg. Schles.
(1878), p. 184. Grunow Desm. Anstr. (1858), p. 501. Wood
F. Wat. Algie U.S. (1872), p. 107. Wittrock Scan. Desm.
(1869), p. 20. Notaris Desm. Ital. (1867), p. 67, t. 8, f. 75.
fiabh. Alg. Eur. (1868), p. 118. Jacobsen Desm. Denm.
(1874), p. 165.
Closterium lamellosum, Breb. Alg. Fal. (1835), p. 59, t. 8.
Closterium digitus, Ehr. Abh. Berl. Ak. (1881), p. 68. Ehr.
Inf. (1838), t. 6, f. 8. Hassall Fr. Alg. (1845), p. 376,
Penium oblongum, D. By. Conj. (1858), t. 7, G. fig. 1-2.
Pleurosicyos myriopodus, Gorda Aim. Carls. (1835), t. 5,
f. 68.
L
DESMIDIB.®.
Hab. In pools, &c.
Widely distributed in England, Wales, Scotland ; France,
Germany, Italy, Sweden, Russian Lapland, Norway, Denmark,
Austria, United States.
Plate X V I ., f ig .1. a, living frond ; 5, empty frond.
F e n ium in te x r u p tum . Breb. in Ralfs. Lesm., p . 151, t. 2 o ,f. 4.
Frond large, stout, smooth, three or four times as long as
broad, cylindrical, sides parallel, extremities conical and rounded
at the ends, endochrome disposed in straight, strongly marked
fillets, interrupted by three transverse pale bands, having a
rounded, well-defined, clear space near the ends, in which are
active granules.
Siz e . Diam. 88-44 p (W.) ; diam. 87-44 p (K.) ; length
280-320 p ; diam. 50-64 p (D.).
Breb. Liste Desm. (1856), p. 146. Archer in Prit. Inf.
(1861), p. 751, t. 3, f. 45. Delponte Desm. (1878), t. 15, f.
1-9. Oleve Sver. Desm. (1864), p. 493. Lundell Desm. Suec.
(1871), p. 84. Nordstedt Norges Desm. (1873), p. 43. Petit
Liste Desm. Paris (1877), p. 28. Wood F. Wat. Alg® U.S.
(1872), p. 108. Rabh. Alg. Eur. (1868), p. 119. Wolle
Desm. U.S. (1884), p. 35, t. 5, f. 14, 15. Kirch. Alg. Schles.
(1878), p. 135.
Penium digitus ¡3 interruptum, Klebs. Desm. Pruss. (1879),
p. 25.
Closterium interruptum, Jacobsen Desm. Denm. (1874), p.
167.
H ab. In ponds, pools, &c.
Sussex, Westmoreland, Cornwall, Wales; France, Germany,
Italy, Sweden, Norway, United States.
Plate X V I ., fig. 2. a b c, living fronds.
F e n ium c lo s te iio id e s . Ralfs. Lesm., p. 152, t. 3 4 ,/. 4.
Frond rather large, about six times as long as broad, smooth,
fusiform or lanceolate, ends broadly rounded; endoohrome in
distinct longitudinal fillets, interrupted only by the central
transverse pale band with a single longitudinal series of large
granules, and a rounded clear space close to the ends, in which
are active granules. Zygospore globose, smooth.
Siz e . Diam. 40-44 p (W.) ; diam, 40-44 p ; zygospore
46-56 p (K.).
Brebisson Liste Desm. (1856), p. 146. Archer in Prit. Inf.
(1861), p. 751. Delponte Desm. (1878), t. 15, f. 19, 25 (in
part). NJtaris Desm. Ital. (1867), t. 8, f. 76. Cleve Sver.
Desm. (1864), p. 493. Lundell Desm. Suec. (1871), p. 84.
1 '
I
I
i
(i ■
•I i
K