Stigonema spiniferum N.L.Gardner

• Region

  West Indies

• Country

  Puerto Rico

• Locality

  Maricao. On shaded earth near the "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

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Determined by Francis ^Jrouet	'

56. Stigonema spiniferum

Portion of a typical plant with hormogonii'erous
branches and, T, a cross-section............................................. x 250

Stigonema spiniferum sp. nov

Plate 22, figure 56

Filaments 500-700 u long, 35-45 y (up to 60 p) diam.,, very

irregularly and profusely branched, no distinction into main

’ fronds and branches; all branches more or less attenuated and
i - • •

terminating in more or less curved, spine-like, hormogonial por-
tions; cells multiseriate in part but usually 4-seriate, in distinct
Modular clusters, when numerous subsphetical, usually the lon-
gitudinal diameter longer than the cross diameter, olive-green,
homogeneous; sheath 10-15 ¡j thick, hyaline, homogeneous, in age
the teguments of the individual cells and groups of cells yellow-
ish; the hormogoniferous apical portions, or branches, thick,
white, attenuated to a very sharp jwint, 60-90 p long; hormo-
gonia usually clavate and uni seriate, larger at the ou ter end,
escaping by rupture of the outer end of the spine; heterocysts
sparse and inconspicuous.

Growing on soil at “Campo,” Maricao, wo. 1229, type.

Stigonema spiniferum is closely related to 8. cornutum of
this paper, but differs from that species in having larger cells,
fewer series of cells, and particularly in having all of the vege-
tative branches terminating in long, more or less curved, hyaline
spines, bearing the hormogonia, whereas in 8. cornutum the hor-
mogoniferous branches are specialized.

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DARIUS OGDEN MILLS FUND

FRESHWATER ALGAE OF PORTO
COLLECTED BY PROFESSOR N. WI
Maricao February 32-16? 1

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00953621