Scytonema guyanense var. minus N.L.Gardner

• Region

  West Indies

• Country

  Puerto Rico

• Locality

  Arecibo to Utuado, on the rocks along the roadside

• Coordinates

  18.3736, -66.7096

• Distribution

  Map all specimens of this taxon

THE

NEW YORK BOTANICAL GARDEN

DARIUS OGDEN MILLS FUND

FRESH-WATER ALGAE OF PORTO RICO

COLLECTED BY PROFESSOR N. WILLE
Arecibo to Utuado March 4, v^'5

NEW YORK
BOTANICAL
CARDEN

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Scytonema guyanense minus var. nov.

Filaments 12-18 m diam., long, ilexuons, forming a thin, fioc-
cose stratum; trichomes lip to 13 m diam. at the apices, 6-8 m in
older parts; cells cylindrical, or slightly torulose at the apices,
quadrate or iess at the apices of the trichomes, 2-4 times as
long as the diameter in the older parts, homogeneous or with a
few refringent granules; sheath slightly lamellose, lamellae not
diverging.

Growing on lava between Arecibo and Utuado, no. 1455, type.

Variety minus, as diagnosed above, differs from the species
chiefly in having on the average smaller filaments, thinner and
less lamellose sheaths, and longer and narrower cells in the main
body of the filament.

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FRANCIS DROUET

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