Seirospora purpurea M.Howe

• Region

  North America

• Country

  Bermuda

• Locality

  Gravelly Bay, in cave

• Coordinates

  32.3172, -64.7138

• Coordinate Uncertainty (m)

  164.339

• Georeferencing Method

  Georeferencing Quick Reference Guide, Version 2012. Unable to find a cave. Located coord. on shore closest to geogr. center of Gravelly Bay. Meas. from coord. to farthest extent of shore to find lin. ext. (152.77 m). Input info. into MaNIS Geo. Calc. to find uncert. radius.

• Geodetic Datum

  WGS84

• Distribution

  Map all specimens of this taxon

Phycotheca BoreaIi=Americana.	Collins, Holden and Setchell.

Algae of Bermuda.

2045. Callithamnion byssoideum Am.
var. jamaicense coiims.

Collins, in P. B.-A., No. 443; Proc. Amer. Acad., Vol. XXXVII
p. 258, 1901.

In cave, Gravelly Bay.

a.	Feb. 23, 1913.

b.	Dec. 15, 1913.

A. B. HERVEY.

The same species, from Jamaica, was distributed as
P. B.-A., No. 443.

NEW YORK BOTANICAL GARDEN

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Seirospora purpurea M. A. Howe, sp. nov. Plants purple-lake or dahlia-
carmine forming dense, more or less felted, pulvinate tufts 1-2} cm. high, rami-
fication repeatedly decompound, for the most part obscurely quinquefarious, the
ultimate ramelli dichotomo-subdistichous and often subfastigiate; main axes
0.15-0.25 mm. in diameter at base, rather sparingly corticated for one half
or more of their length by narrow-celled rhizoids, and in basal parts clothed
in addition by free sometimes spirally entwined rhizoids, occasional cells of
the upper ramuli also sending out elongate, free, long-celled, simple or spar-
ingly branched rhizoids; largest uncorticated cells of the main axes 40-95 n
in diameter, subcylindric or slightly, enlarged at the nodes, 14—2} times as
long as broad, their walls 8—20 fj. thick; cells of the ultimate ramelli mostly 2—4
times as long as broad, the terminal obtuse, 6—13 in diameter, hairs apparently
wanting; dioicous; antheridia ovoid, lance-ovoid, dimidiate-ovoid, or ellipsoid,
occurring singly at the _nodes, erecto-patent, often incurved, 48-65^ high,
26-40 ju. broad; cystocarps somewhat hemispheric, 0.3-0.4 mm. broad, composed
of free, erecto-patent, moniliform, sporogenous filaments, the ellipsoid or ovoid
c-arpospores 35-40 ¡x long; tetrasporangia scattered, solitary at the nodes,
obovoid or ellipsoid, 50-65 n in maximum diameter, tetrahedrally divided.
(Phyc. Bor.-Am. 2045, as Callithamnion byssoideum jamaicense Collins.)

Type from a cave, Gravelly Bay, A. B. Hervey (Phyc. Bor.-Am. 2045) in
the herbarium of the New York Botanical Garden.

Seirospora purpurea bears some resemblance in habit to small dense con-
ditions of Callithamnion corymbosum and C. byssoides, but is easily distin-
guished by the sheathing of the basal parts of the main axes by free rhizoids
in addition to the cortications, by the frequently rhiziniferous cells of the
smaller branches and the consequent more or less felted condition of the tufts,
and more especially by having the cystoearp of a Seirospora, with its free
sporogenous filaments, instead of the solid cystocarp of a Callithamnion with
its common enclosing wall. The European Seirospora? Gaillonii (Crouan)
De-Toni is possibly a nearer relative. The Jamaican Callithamnion byssoi-
deum jamaicense Collins (Phyc. Bor.-Am. 443) is manifestly a different thing.
The cells of S. purpurea are apparently all uninucleate. Endemic.

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Bath Maine. U.S.A.
Bermuda Dec. 15,1913.

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