Batrachospermum boryanum Sirodot

• Region

  North America

• Country

  United States of America

• State/Province

  Massachusetts

• County/Municipio

  Middlesex Co.

• Locality

  brook in Middlesex Fells

• Coordinates

  42.4524, -71.1015

• Coordinate Uncertainty (m)

  3481.38

• Georeferencing Method

  Georeferencing Quick Reference Guide, Version 2012. Can't find brook. Located coordinates of geogr. center of Middlesex Fells. Measured from coord. to farthest extent of the park 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

Phycotheoa Boreali-Amerioana. Goliins, Holden, and SetohelL
187. Batraebospennuin Boryanum sirdt.
Slrodofc, Les Batrachospermes, pp. 246-249, Pis. XXIX-XXXI, 1884.
a.	In running brooks, winter and spring, Bridgeport and Strat-
ford, Conn.
ISAAC HOLDEN.
b.	Brook in Middlesex Fells, Mass., April 14, 1890.
With antheridia.
F. S. COLLINS.
c.	44 Chantransia ” stage. Very abundant all winter on Potamog-
etón, etc., in swift water in Huron River, Ann Arbor, Mich., Nov.
1898.
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 trichogyne is ovoid, but is generally distorted so as not to be readily
distinguished from the lageniform trichogyne of the moniliforme group.
The species differs from any of that section as well as from those of its own
section in being completely dioecious. 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 the various specimens distributed.
The prothalloid 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 (c). This species reaches
a length of 25-30 cm.
W. A. S.
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