Nostoc album N.L.Gardner

• Region

  West Indies

• Country

  Puerto Rico

• Locality

  Near Maricao.

• Coordinates

  18.1768, -66.9782

• Geodetic Datum

  WGS84

• Distribution

  Map all specimens of this taxon

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THE NEW YORK BOTANICAL GARDEN

DARIUS OGDEN MILLS FUND

FRESHWATER ALGAE OF PORTO RICO
COLLECTED BY PROFESSOR N. WILLE,
Maricao February 12-15, 191 i

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Nostoc album sp. nov.

Thallus spherical, up to 500 m diam., very smooth on the sur-
face ; trichomes tortuous, but not congested, bright olive-green to
violet; cells subspherical or dolioform, very finely granular;
heterocysts spherical, 6-7.4 m diam., single, fairly abundant;
tegument almost transparent, firm.

Growing among moss near a stream in the vicinity of Mari-
cao, no. 1149, type.

It is possible that the above-described new species of Nostoc
may be the juvenile stage of another species. The colonies are
in all stages of development from short filaments with only a few
cells to colonies up to one-half millimeter in diameter. There is
considerable indication that the largest colonies are nearing ma-
turity, as some of them show the formation of hormogonia. I
was unable to discover any resting cells, but the fact that among
the numerous .very young Colonies there is no indication that
any of them originated from resting cells leads me to conclude
that possibly there is no formation of single resting cells and
that reproduction takes place only by formation of hormogonia.

More observations on the life history of the organism will
be necessary to establish its specific status.

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The New York
Copyright reserved Botanical Garden

Determined by Francis Drouet

00953545