Anabaena unispora N.L.Gardner

• Region

  West Indies

• Country

  Puerto Rico

• Locality

  Santurce, in a pool near the Park

• Coordinates

  18.4357, -66.0667

• Geodetic Datum

  WGS84

• Distribution

  Map all specimens of this taxon

NEW YORK BOTANICAL GARDEN

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DARIUS OGDEN MILLS FUND

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COLLECTED BY PROFESSOR N. WILLE
SANTURCE	DECEMBER 25, 1914

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SANTURCE DECEMBER 25, 1914

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Santurce December 25, 1914

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Anabaena unispora sp. nov.

Plate 12, figure 8

Stratum thin, slightly mucous, or trichomes intermixed with
other algae; trichomes short, for the most part straight, slightly
attenuated for several cells; cells cylindrical, slightly constricted
at the dissepiments, 4-4.5 m diam., 1.5-2 times as long as the
diameter, containing few to many small granules; terminal cells
blunt, heterocysts slightly larger in both dimensions than the
cells, one, or rarely two, in a trichome; spores single, developing
at one side of the heterocyst, narrowly to broadly ellipsoidal,
variable in size, 20-34 ¡j long, 13-20 n broad, with a smooth thin
hyaline membrane, or at times the inner layer slightly brownish
in color.

Growing in a pool among other algae and debris near the
Park, Santurce, no. 49 a, type, no. 44 c, and no. 51 d.

The very conspicuous character of this species of Anabaena
is the production of a single resting spore by each plant. The
large majority of plants produce but a single heterocyst, al-
though there are occasionally two in a plant. In case there are
two usually one is located near the end of the trichome and the
other near the center in its characteristic position. However,
no plants were seen with more than one spore. In number 47 c
of the collection, and in scattered filaments in several other col-