Scytonema lyngbyoides N.L.Gardner

• Region

  West Indies

• Country

  Puerto Rico

• Locality

  Utuado to Adjuntas

• Coordinates

  18.2228, -66.7326

• Distribution

  Map all specimens of this taxon

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Determined by Francis Drove.

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?5T Scytonema lyngbyoides

Terminal portion of a filament with typical gemi-
nate branching.......................................................................................... x 250

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Annotât

THE NEW YORK BOTANICAL GARDEN

DARIUS OGDEN MILLS FUND

FRESH WATER ALGAE OF PORTO RICO
COLLECTED BY PROFESSOR N. WILLE
Utuado to Adjuntas March io, I9l5®r*~-r .

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.6	BOTANICAL

NEW YORK BOTANICAL GARDEN

00953287

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Scytonema lyngbyoides sp. nov.

Plate 17, figure ;>5

Filaments forming a dense velvety stratum, or more or less
intertwined and pannose, 28-32 |i diam. in main filaments,
branches as small as 20 p diam.; trjehomes 18-25m diam., more
or less constricted at the dissepiments; colls onerthird to one-
sixth as long- as the diameter, bright violet to olive-green, homo-
geneous; cross-walls thin, hut distinct; heterocysts of the same
shape and size as the cells, hyaline, sparse; sheath hyaline,
homogeneous; branching geminate for the most part, occasion-
ally single.

Growing on rocks in a brook about five kilometers north of

Utuado, no. 1007, type1; on rocks between Utuado and Adjuntas,
no. 1646.

The violet or dark olive-green color of the trichomes, the
homogeneous hyaline sheath, the sparsity of the hyaline hetero-
cysts, and the lack of allundant branching, characteristic of the
above newly described species, remind one at first slight of the
genus Lyngbya; hence tfie specific name.

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