Rivularia compacta Collins

• Region

  North America

• Country

  United States of America

• State/Province

  Massachusetts

• County/Municipio

  Middlesex Co.

• Locality

  Spot Pond

• Coordinates

  42.4553, -71.0922

• Coordinate Uncertainty (m)

  1231.57

• Georeferencing Method

  Georeferencing Quick Reference Guide, Version 2012. Located coordinates on shore closest to geogr. center of Spot Pond. Measured from coord. to farthest extent of the pond to find linear extent (1220 m). Used MaNIS Georef. Calculator to find uncertainty (Bounded Area).

• Geodetic Datum

  WGS84

• Distribution

  Map all specimens of this taxon

NEW YORK BOTANICAL GARDEN

Rivularia compacta, n. sp. Colline,
Rhodora 1: 10. Ja I899.

Fronds globose or subglobose, firm, not encrusted with lime, dark green or
blackish, smooth, minute, seldom over 2 mm. diameter. Filaments closely packed,
sheaths 1^-20 /a. diameter, colorless or yellowish, more or less expanded above;
triohomes 6-10/* diameter, aerugineous; articulations about as long as broad be-
low, one third to one quarter as long above, subtorulose, tapering gradually to
a hair-like termination; heterocysts basal, globose or oblong.

It resembles R. minutula (liuetz*) Bom. & Flail*, but the thalli are much
firmer, and not at all encrusted with lime; the trichomes are slenderer, and the
filaments more densely packed. In some particulars it agrees with the descrip-
tion of Ro Beccariona (De Not*) Born« cb Flah*, Revis. des Nost. Het., part 2, p.
56; but the latter has more slender trichomes, with longer articulations and much
narrower sheaths. It grew in abundance at the locality mentioned, in company wiith
Schizothrix lacustri3 var. caespitosa Gomont. It has also been found by Professor
W, A* Setchell, nearNorwich, Conn*

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copyright reserved

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508. Rivularia compacta Collins, ms.

On stones, shore of Spot Pond, Middlesex Fells, Massachusetts,
Sept. 21, 1890; in company with Schizothrix lacustris var. caespitosa.

F. S. COLLINS.

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