Callithamnion halliae Collins

• Region

  North America

• Country

  United States of America

• State/Province

  Florida

• County/Municipio

  Monroe Co.

• City/Township

  Key West

• Locality

  washed ashore

• Coordinates

  24.5591, -81.7816

• Coordinate Uncertainty (m)

  3481.57

• Georeferencing Method

  Georeferencing Quick Reference Guide, Version 2012. Located coordinates of geogr. center of Key West. Measured from coord. to farthest extent of the key to find linear extent (3470 m). Used MaNIS Georef. Calculator to find uncertainty (Bounded Area).

• Geodetic Datum

  WGS84

• Distribution

  Map all specimens of this taxon

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Annotated by Nilda E. Aponte
698. Callithamnion Halliae Collins ms.
Washed ashore, Key West, Florida.
MRS. G. A. HALL.
Frond up to 5 cm. high, usually with a percurrent axis, straight
below, becoming flexuous near the top, up to .2 mm in diameter at the
base, not corticated, with similar alternate branches; these sometimes bear-
ing a second series; the next series of branches dividing dichotomously,
at first at wide angles; the subsequent forkings less and less patent,
ultimate divisions of one to several cells, from .01 to .02 mm. diam., not
much tapering, end * slightly rounded, without terminal hair. Cells
throughout the frond usually about 4 times as long as broad, but where the
forkings are very dense, 1 to 2 times as long. Cystocarps depressed
spherical, not distinctly lobed, single or several together, situated in the
forking of a lateral branch, or on the side of a main filament. Antheridia
forming tufts on the upper side of the ultimate ramuli, occurring on the
same individual as the cystocarps. Tetraspores tripartite, occasionally
cruciate, pyriform, sessile on the upper side of the ultimate ramuli, often
one on each joint. Color a pale to a deep rose.
This species presents quite a difference in habit, according as the
alternate or the dichotomous system of branching is most developed, and
as the latter is more or less dense. The two extreme forms resemble
respectively C. Baileyi and C: corymbosum; its nearest affinity would
seem to be with C. corymbosum. It adheres well to paper.
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