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S52 51.Nostoc. 2.THALASSI0PHYT^ Pl.cell.aph.
4. N'osloc pruniforme. Phimshape nostoch.
ThaUus blackish, globose, solitary, solid, leatheiiike,
gelatinous, smooth.
Ulva pruiiiformis, Lin. S. P. 1633,
Tremeila pruniformis, Roth Germ. 548,
Linckia pruniformis, Roth Cat. 3, 343.
l^ostoc pruniforme, Agardh Syn. 134.
Adhering to trees, or floating in lakes; summer.
Thallus gelatinous on the inside, coriaceous on the out-
side.
H. Nosloc sphcBricum. Sphcerical nostoch.
ThaUus black green, globose, solid, smooth, aggregated.
Ulva pruniformis, Hudson Fl. Angl, 572, not of Eng. Bot.
Conferva Pyrum, Fl. Dan. 660, not of Linnaeus.
Nostoc spiiffiricum. Voucher, 223.
Lickia granulate, Roth Cat. 3, 342.
Lakes and stagnant waters.
Thallus hardish, gelatinous, mostly aggregated, the size
of peas.
6. Nosloc ccerulenm. Blue nostoch,
Thallus small, globose, solid, solitary, smooth, pale blue,
shining, pellucid.
Nosloc CEEruieum, Lyngbye Hydr. Dan. 201.
Ditches and pools on hypni; summer.
Thallus hard, slippery, about a quarter of an inch in
diameter.
7. Nosloc papyraceum. Paper nostoch.
Thallus frothy, gelatinous, slippery, easily parted,
bluish.
Byssiis latissima papyri instar super aquara sparsa, Dillm in Rail Syn.
S7, 12; Dillen Muse. 2].
Bysfus Flos aquae, Lin. S. P. 1637.
Nostoc Flos aquae, Lyngbye Hydr. Dan. 201.
Stagnant waters, floating; spring and summer.
ThaUus pale bluish green ; when it covers ponds, they
are said to be in flower.
G. Alcyonide^. ThaUus continuous, gelatinous, olive
green becoming black, cellular; cells membranaceous,
lono-, hexaedral; sporidia elliptical,scattered in the cells.
XXVII. 52. ALCYONIDIUM. Lamour. Ualcyonide,
Thallus roundish, long, gelatinous, branched, olive-green;
inner cells
— Marine.
large, hexaedral, outer cells slender, closed.