Rivularia flagelliformis N.L.Gardner

• Region

  West Indies

• Country

  Puerto Rico

• Locality

  in a water reservoir near Rio Piedras

• Coordinates

  18.3832, -66.05

• 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
Rio Piedras December 28, 1914

NEW YORK
BOTANICAL

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00937895

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FRANCIS DROUET&Hn

Rivularia (Gloeotrichia) flagelliformis sp. nov.

Plate 14, figure 25

Thallns globose to irregular, very soft and gelatinous or mu-
cilaginous in consistency, about 1 cm. diam.; trichomes a con-
siderable distance from each other, constricted at the dissepi-
ments throughout except the terminal hair in the juvenile stage,
but on nearing maturity the condition disappearing except with
a few cells at the base, up to 1 mm. long, 5.0-6.8 p diam. at the
base before spore formation begins, tapering gradually from the
base to the apex, terminating in a long hair 1-1.8 m diam.; cells
granular, aeruginous, mostly quadrate, hair cells 4-6 times as
long as broad; heterocysts hyaline, mostly spherical, 11—14 p
diam., others vary from ellipsoidal to conical; sheath undulate,
hyaline, visible for about 80 |i, then vanishing into the common
transparent gelatinous tegument; spores densely congested with
very fine granules, 11-14 m diam., up to 80 m long.

Growing in a water reservoir near Rio Piedras, no. 126, type.

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Rivularia (Gloeotrichia) flagelliformis

To the left, portions of typical filaments, to the
right, portion of a filament showing one resting
cell or spore................................................................................................ x 500

00937895