Herposiphonia rigida N.L.Gardner

• Region

  North America

• Country

  United States of America

• State/Province

  California

• County/Municipio

  Los Angeles Co.

• Locality

  Santa Catalina Island, in vicinity of Avalon

• Coordinates

  33.3365, -118.327

• Coordinate Uncertainty (m)

  5391.57

• Georeferencing Method

  BioGeomancer, Guide to Best Practices for Georefer. Located coordinates of geogr. center of Avalon. Measured from coord. to farthest extent of the city x2 = linear extent (5380 m). Used MaNIS Georef. Calculator to find uncertainty (Near a Feature).

• Geodetic Datum

  WGS84

• Distribution

  Map all specimens of this taxon

Herposiphonia rigida Gardner, sp.nov.
Univ.Calif.Publ.Bot.14:100.pi.23. f.1-2. 7 D 1927.
Fronds composed of a relatively extensive system of
creeping filaments attached on the under side by numerous
rhizoidal filaments and giving rise to numerous alternate,
erect "branches; erect fronds 1-2.5 cm. high, with a central
percurrent axis about 250p. diam, and composed of ?-11 peri-
central cells about 2-3 times as long as their diameter,
giving rise to two kinds of branches, viz.,2 (sometimes 3)
orders of "branches similar to the main axes, each order re-
duced in size; and ujnbranched, rigid, subulate, alternate,
slightly attenuated, blunt ramuli about 1.25 mm. long,aris-
ing from every node except those occupied by the large
branches, and standing at an angle of about 70ř; branches
and ramuli both distichous; 3 ramuli intervening the branches
of each order, these orders being regularly alternate; ramuli
more or less twisted; all parts of the frond relatively ris^a?
color very dark on drying; tetrasporangia in a single series
in the ramuli, relatively sparse; cystocarps relatively large,
slightly urceolate, sessile near the base on the adaxial side
of the ramulus; cystocarps and antheridia unknown.
Growing on filamentous Oorallines, etc.,in the upper sub-
littoral belt. Friday Harbor, Washington, to Santa Monica,
California. Type, Gardner, no. 6023 (Herb. Univ. Calif, no.
276868), dredged in the vicinity of Friday Harbor. July*
In the character of the method of branching, this species
of Herposiphonia is almost identical with H. grandis Kylin,
but the prostrate portion of the frond is more extensive and
the erect portion less extensive than in Kylin?s species from
the same general locality. Also the fronds are much more rigid
and are almost black on drying, H. grandis being more flaccid
and a dark red or brownish red on drying. In eaoh species the
main branches of all orders are alternate and distichous and
are separated regularly on eaoh side by three subulate ramuli.
DUDLEY HERBARIUM OF STANFORD UNIVERSITY^^ yoRk
Plants of California	b&TAHJCAL
Herposiphonia rigida Q-ardn.	*arden
41-315
On rocks In deeply shaded tide pool at
- ti# foot tide level.
Cypress Pt.,
Monterey Peninsula, Calif.
7/9/41
G.^ Smith
co]
& det.
Algae distributed from the Herbarium of the
University of California N EW YOR&.
botanical
Herposiphonia rigida Gardner garden.
Carmel Bay, California
May 1916
H. L. Gardner. Ho. 3365
.....
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MARINE ALGAE OF CALIFORNIA
_Herposiphonia rigida var laxa S.&G.
Locality:Santa Catalina Island
Habitat: Rocky shore in vicinity of Avalon
Collected by E. Yale Damon 3/23"*24A94á No.
det by E.Y. D.
ALGAE
DISTRIBUTED BY THE ALLAN HANCOCK FOUNDATION
THE UNIVERSITY OF SOUTHERN CALIFORNIA
NEW ;
BOTA
GAF
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