Stigonema cornutum N.L.Gardner

• Region

  West Indies

• Country

  Puerto Rico

• Locality

  Maricao, by "Campo"

• Coordinates

  18.1724, -66.9437

• Coordinate Uncertainty (m)

  11481.5

• Georeferencing Method

  Georeferencing Quick Reference Guide, Version 2012. Located coordinates of geogr. center of Maricao. Measured from coord. to farthest extent of the region to find linear ext. (11470 m). Used MaNIS Georef. Calculator to find uncertainty (Bounded Area).

• Geodetic Datum

  WGS84

• Distribution

  Map all specimens of this taxon

NEW YORK BOTANICAL GARDEN

y	THE NEW YORK BOTANICAL GARDEN

BOTANICAL	DARIUS OGDEN MILLS FUND

GARDEN	FRESHWATER ALGAE OF PORTO RICO

COLLECTED BY PROFESSOR N. WILLE
MARICAO FEBRUARY 12-15, 1915

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Stigonema cornutum sp. nov.

Pi jATE 21, FIGURE 515

Filaments very irregular in shape and size, the main part
usually very blunt, 25-30 p (up to 50 p) diam.; branches of two
sorts, one similar to the main frond, sparse, arising without any
order, deeply constricted at the base, later completely separated
at the constricted base from the parent frond; the other more
numerous, arising in a similar manner, smaller, bearing a long,
sharp, usually curved, hyaline apex, changing to amber color
after the hormogonia disappear, the latter may or may not be.
deciduous; cells 4-6-seriate, 8-12 p diam. heferocysts small,
rather sparse; sheath homogeneous, hyaline, changing to
slightly yellowish when old.

Growing on soil along the road toward^ Monte Montoro,
Maricao, no. 1077, type; on moss, fern roots, etc., between Aibo-
nito and Cayey, no. 1975.

The cornute habit of Stigoneyna cornutum reminds one of
Kuetzing’s Stigonema polyceras (1851, pi. '38) in which the
attenuated portion contained cells. It was learned later that
Kuetzing’s plant is a lichen. The attenuated portion of the
branches in the above species, consists of homogeneous, hyaline
tegument, and the plant is a typical Stigonema. The cells in no.
1290 are larger than those of the type and more regularly ar-
ranged in nodes.

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