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REPORT OF THE COMMISSIONER OF FISH AND FISHERIES. 29
p. 157, Pl. VI, Figs. 1-10. (Microhaloa rosea, Kütz., in Linnea, VIII, 341.—
Protococcus, Kütz., Spec. Alg.—Pleurococcus roseo-persicinus, Rab.‚ Flora Europ.
Alg.—Cryptococcus roseus, Kütz., Phyc. Gen.; Le Jolis, Liste des Algues Marines;
Crouan, Florule du Finistère; Farlow, List of Marine Algæ, 1876.—Bacterium
rubescens, Lankaster, in Quart. Journ. Micros. Science, Vol. XII, new series, p. 408,
Pl. 22 and 23.)
Cells very small, about .0025 mm in diameter, rose-colored.
Whole New England coast; Europe. Both marine and in fresh water.
Very common on decaying algæ and on the mud, which it covers with a purplish-red film. It is also
found on codfish in the Gloucester market, causing what is known as the red fish. This alga, of which
the detailed history is given by Cohn and Lankaster, l. c., after having been placed by different writers
in several different genera, has finally been associated with Clathrocystis æruginosa, Henfrey, a
common fresh-water alga of Europe and the United States. Both species are at first minute and solid,
but as they grow older become hollow, and at length portions become detached, leaving holes in the
circumference. Although in Europe the species is found in fresh water as well as in salt, it has not yet
been observed in the interior of this country.
ENTOPHYSALIS, Kütz.
(From εντος [entos] and φυσαλις [physalis], a bladder.)
Cells united in colonies, which assume a dendritic form.
The genus is founded on Entophysalis granulosa, a species of the Mediterranean, referred by Zanardini
to the Palmellaceæ, but more correctly by Thuret and Bornet to the Chroococcaceæ.
E. MAGNOLIÆ, n. sp.
Cells dark purple, .004-6 mm in diameter, united in twos and fours and imbedded in
jelly, which forms a densely branching mass. Magnolia Cove, Gloucester, Mass.
Rare. Autumn.
This alga forms a thin slime on exposed rocks, in company with Glœocapsa crepidinum. The
ramifications of the frond are visible on careful dissection. The species is much smaller and differs in
color from E. granulosa of Europe. The cells do not differ much in size from those of the Glœocapsa, but
they are of an entirely different color and have the concentric arrangement of the cell-wall much better
marked than in that species. The cells adhere together in twos, fours, or some multiple of four, and all
are held together by a mucous mass, which branches in a very dense fashion. The genus Entophysalis is
merely a Glœocapsa, which instead of being indefinitely expanded is densely ramified.
SUBORDER NOSTOCHINEÆ.
(Nematogenæ, Cohn in part.)
We have followed Thuret’s Essai de Classification des Nostochinées, Ann. des
Sciences, 6 série, Tome I, in the arrangement of the genera.
1. Filaments terminating in a hyaline hair......................................7
Filaments destitute of a terminal hair .........................................2