Anacystis cylindracea N.L.Gardner

• Region

  West Indies

• Country

  Puerto Rico

• Locality

  Utuado to Adjuntas, on limestone

• Coordinates

  18.2228, -66.7326

• Distribution

  Map all specimens of this taxon

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THE NEW YORK BOTANICAL GARDEN

DARIUS OGDEN MILLS FUND	____---——

FRESHWATER ALGAE OF PORTO R^O _
COLLECTED BY PROFESSOR N. WILIXE
Utuado to Adjuntas March 10, >915

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Arracystis cylindracea sp. nov.

Plate 3, figure 35

Colonies spherical, up to 125 p diam., free; cells up to 64 in
a colony, widely separated, cylindrical with rounded ends, bright

blue-green, homogeneous, 6-7.5 p diam., 10-14 p long; resting
spores of the same shape as the cells, but slightly enlarged and
surrounded by a thin, smooth, hyaline, membranaceous wall;
tegument opalescent, ample (8-12 p thick), homogeneous
throughout the colony; spores sometimes germinate in the
mother utricle, or tegument.

Growing among the Myxophyceae on rocks, between Utuado
and Adjuntas, no. 1640 a, type.

The majority of the species of Anacystis have either spher-
ical cells or cells which are more or less irregular and angular.

A. cylindracea departs from the rule as to the form of the cells,
but conforms to the typical species in its life cycle. Starting
from a single cell the mature colony is built up by cell divisions
after the usual manner, the resulting cells having no visible dif-
ferentiated membrane, but all are embedded within a common,
homogeneous, more or less gelatinous matrix or tegument. At
maturity the cells develop a thin, firm, membranaceous, smooth,
hyaline wall, becoming resting spores of the typical sort. At
this stage it may depart from the usual procedure. The resting
spores germinate in position before the dissolution of the parent
utricle. A new gelatinous matrix, or tegument, is laid down
within the membranaceous wall. The cells then have the ap-
pearance of certain species of Gloeothece with the usual special,
or individual tegument. Sooner or later these young colonies
are liberated and the new life cycle continues independently.

7 EW YORK
botanical
CARDEN

'tr

%

THE PLANKTONIC FRESHWATER SPECIES OF MICROCYSTIS
Francis Drouet & William A. Daily, 1939

The New York

copyright reserved botanical garden

Determined by Francia Drouet and William A. Daily

Determined by Francis Drouet

35.

Anacystis cylindracea

A single typical colony, showing typical cells and
ample homogeneous tegument............................. x 500

00953566