Sebdenia heteronema M.Howe

• Region

  South America

• Country

  Peru

• Locality

  Bay of Sechura, dredged in about 5 fathoms

• Coordinates

  -5.58219, -80.9528

• Coordinate Uncertainty (m)

  46841.6

• Georeferencing Method

  Georeferencing Quick Reference Guide, Version 2012. Located coordinates of geogr. center of Bay of Sechura. Measured from coord. to farthest extent of the bay to find linear extent (46830 m). Input info. into MaNIS Georef. Calc. to find uncert. radius (Bounded Area).

• Geodetic Datum

  WGS84

• Distribution

  Map all specimens of this taxon

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THE NEW YORK BOTANICAL GARDEN

MARINE ALGAE OF PERU, COLLECTED BY ROBERT E. COKER

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Cryptonemia heteronema (Howe) Acleto

n. comb.

det- E. Soler Onîs	. . ^

(Rijksherbarium, Leiden)	August , 19 95

-I* Univ. Las Palmas de Gran Canaria

Sebdenia heteronema sp. nov.

Plane, membranaceous, scarcely gelatinous, up to 30 cm. long,
irregularly and subpalmately divided, the main segments mostly
elliptic-oblong with broad, obtuse, retuse, or sometimes lobed or
lacerate apices, the margins and both surfaces bearing numerous
obcordate, obovate, suborbicular, or subreniform, short-stipitate
or subsessile foliolar innovations 0.5-2.5 cm. in diameter, the
incipient or abortive innovations rendering the surface scabrous
here and there, and the commonly incrassate, often duplicate,
margins now and then glandular-denticulate or glandular-crenulate
from the same cause; thallus mostly 80-175 M thick; medulla
rather compact and firm, composed mostly of interwoven hyphae
5~io u in diameter, these surrounding and filling in a framework
consisting of comparatively few much larger, rarely segmented,
stiaight or contorted, anastomosing filaments, commonly 12-35 M
in diameter, from substellate ganglia (these often 40-50 /jl in diam-
eter) and having homogeneous refringent, less often granular,
contents, such filaments passing rather abruptly into the much
shorter, narrower, and more granular cells of the subcortex;
cortex firm, 25-40 ^ (2-4 cells) thick, the ultimate cortical fila-
ments shore, 1 or 2 cells long; the superficial cells 4-18 ¡j. high
(including¿-6 n of outer wall), 1-23^ times as high as broad,
angular-oroicular and 4-11 ¡x in diameter in surface view, w'ith
iimiting walls indistinctly defined; tetrasporangia 19-28 ¡jl X 8-
13 the spores decussately paired. [Plate 58.]

“Dredged in about five fathoms,” Bay of Sechura, April 8,
1907, Coker 157 p.p.,—a single tetrasporic plant, without the base.

J&r 16>A, tbÿ. lf/ÿ'

Plate 58. Sebdenia heteronema
Photograph of the type specimen (Coker 157 p.p.—from liquid preservative),
reduced to a little less than one third of the natural dimensions.

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00922231