Calothrix evanescens N.L.Gardner

  • Filed As

    Rivulariaceae
    Calothrix evanescens N.L.Gardner ( holotype )

  • Collector(s)

    J. N. F. Wille 1776 a, 15 Mar 1915

  • Location

    Puerto Rico. in water near Jayuya.

  • Habitat

    In water.

  • Notes (shown on label)

    + Phormidium angustissimum (1776). Calothrix parietina (Nag.) Thur.

  • Specimen Notes

    Mounted with the paratype Wille 411 (barcode 00937727).

  • Identifiers

    NY Barcode: 00937726

    Occurrence ID: c03d470f-87cc-42d9-84a0-f0f82fd9664d

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    Send comments on this specimen record

  • Region

    West Indies

  • Country

    Puerto Rico

  • Locality

    in water near Jayuya

  • Coordinates

    18.2211, -66.5917

  • Coordinate Uncertainty (m)

    9171.57

  • Georeferencing Method

    Georeferencing Quick Reference Guide, Version 2012. Located coordinates of geogr. center of Jayuya. Measured from coord. to farthest extent of the municipality to find linear ext. (9160 m). Used MaNIS Georef. Calculator to find uncertainty (Bounded Area).

  • Geodetic Datum

    WGS84

  • Distribution

    Map all specimens of this taxon

THE NEW YORK BOTANICAL GARDEN	YORT<

DARIUS OGDEN MILLS FUND	^nTANlCAL

FRESH-WATER ALGAE OF PORTO RICO ^ „ nD EH
COLLECTED BY PROFESSOR N. WILLE
Coamo Springs January >^/jTi9i5

No. 7^//

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NEW YORK BOTANICAL GARDEN

00937727

NEW YORK
botanical

garden

THE NEW YORK BOTANICAL GARDEN

DARIUS OGDEN MILLS FUND

FRESHWATER ALGAE OF PORTO RICO
COLLECTED BY PROFESSOR N. WILLE
Jayuya March 15, 1915

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new york botanical garden

00937726

Determined by Francis Drouet

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Determined by Francis Drouet

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22

Calothcix evairescens sp. nov.

Plate 13, figure 22

Filaments erect or prostrate, straight or curved, rigid, 200-
- 300 ¡j long, 7-8 n diam.; trichomes cylindrical from the basal
heterocyst throughout the larger portion of the length, then
apering to a very narrow, short hair, constricted at the dissep-
iments, 5.5-6.Sp diam.; cells cylindrical to dolioform, quadrate
to one-third the diameter long, mostly homogeneous, pale aeru-
ginous to yellowish or honey-color, mostly showing a clear cen-
tral area; cross-walls relatively thick and conspicuous; apical
. cell blunt and rounded, becoming conical in the young stage of
growth; the apical portion soon prolonged into a short hair;
heterocysts single, basal, spherical to subspherical, same diam-
eter as the tricliome; sheath thin, firm, smooth, homogeneous,
hyaline, vanishing at about half way from the base to the apex.

Growing in water among other Myxophyceae and debris,
Jayuya, no. 1776 a, type; on a wall, Coamo Springs, no. 411.

In certain stages in the life cycle of this species it resembles
the genus Microchciete. The hair dies back, the apical portion
becomes dolioform, the terminal cell enlarges and becomes
rounded, and a sheath is secreted. The whole trichome is then
cylindrical with but a single basal heterocyst. When growth
begins at the apex, the diameter begins to diminish, the apical
cell becomes conical, and finally a short hyaline hair is produced.
It is a very distinct species, related in some of its characters to
C. linearis.

22. Calothrix evanescens

Two typical young filaments....

... x 500

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