Sheathia boryana (Sirodot) E.D.Salomaki & M.L.Vis

• Region

  North America

• Country

  United States of America

• State/Province

  Michigan

• County/Municipio

  Washtenaw Co.

• City/Township

  Ann Arbor

• Locality

  in swift water in Huron River

• Coordinates

  42.291, -83.7257

• Coordinate Uncertainty (m)

  4901.57

• Georeferencing Method

  Georeferencing Quick Reference Guide, Version 2012. Located coordinates of mdpt of Huron R in Ann Arbor by Measured btw endpts; 1/2ing dist., choosing closest coord. on shore. Meas. from coord.- farthest extent of section =linear extent (4890 m). Input info into MaNIS Georef. Calc. = uncert. rad.

• Geodetic Datum

  WGS84

• Distribution

  Map all specimens of this taxon

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ANNOTATION
Batrachospermum boryanum Sirodot
Morgan L. Vis January 1995
Annotation - Nomenclatural Update
Name: Heterocorticum boryanum (Sirodot) E.D. Salomaki &
M.LVis
Annotated by: Morgan L. Vis
Ohio University
Date: July 24, 2012
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Phycotheca Boreali-Amerloana. Collins, Holden, and Setchell.
187. Batradiospermum Boryanum sirdt.
Sirodot, Les Batrachospermes, pp. 246-249, Pis. XXIX-XXXI. 1884.
a. In running brooks, winter and spring, Bridgeport and Strat-
ford, Conn.
ISAAC HOLDEN.
/>. 15rook in Middlesex Fells, Mass., April 14, 1890.
With antheridia.
F. S. COLLINS.
c. “ Chantransia ” stage. Very abundant all winter on Potamog-
eton, etc., in swift water in Huron River, Ann Arbor, Mich., Nov.
1893.
L. N. JOHNSON.
This species, which is very widespread in the United States, although very
variable in external form is however fairly readily recognized. The character-
istic tricliogyne is ovoid, blit is generally distorted so as not to be readily
distinguished from the lageniform tricliogyne of the lnoniltforme group.
The species differs from any of that section as well as from those of its own
section in being completely dinocious. The older specimens are characterized
by the cask-shaped verticils being much separated, while between them there
has been developed a cylindrical growth of interverticillary filaments, as is
shown in tlie various specimens distributed.
The protliaHoid and Chantransia growths of this species are readily ob-
tained and studied, and the “ metamorphosis” was demonstrated by Dr. John-
son in the case of the Chantransia distributed under (e). This species reaches
a length of 25-30 cm.
W. A. S.
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