Membranoptera weeksiae Setch. & N.L.Gardner

• Region

  North America

• Country

  United States of America

• State/Province

  California

• County/Municipio

  San Francisco Co.

• City/Township

  San Francisco

• Locality

  near Cliff House

• Coordinates

  37.7783, -122.514

• Coordinate Uncertainty (m)

  235.569

• Georeferencing Method

  BioGeomancer, Guide to Best Practices for Georefer. Located coordinates on shore closest to approx. geogr. center of Cliff House. Measured from coord. to farthest extent of the property; doubled = linear extent (224 m). Input info into MaNIS Georef. Calc. to find uncert. radius (Near a Feature).

• Geodetic Datum

  WGS84

• Distribution

  Map all specimens of this taxon

iW YORK
?BOTANICAL

arden.	Membranoptera Weeksiae Setchell & Gardner,sp.nov.

Univ.Calif.Publ.Bot.l3;209. pi.19.f.2. 6 U 1926.

Fronds 4-8 om. high, 0.5-1.5 mm. wide.profusely branched,
"branches of 4-6 orders, all from the margin, arising at about
45 angle; midrib relatively large and conspicuous, becoming
decidedly stipitate at the base , lateral veins indistinct or
at times absent; margins smooth, entire; cells of the central
part of the midrib about twice as long as broad, relatively
large; fruit typical of the genus.

Growing on rocks in the lower littoral and upper sub-
littoral belts. Central California. Type locality pacific
Grove.

The specimen collected by Mrs. Hall at Santa Barbara
and now in the Herb.J. Agardh, no.31826(fide W.A. Setchell)
may belong to this species. Delesseria alata C.L. Anderson,
Zoe, vol.2, p.224,1891; Howe, Erythea, volfl, p.68,1893.

I have not had an opportunity to examine any of the
material cited in these two publications and therefore
cannot speak with certainty as to the correctness of the
synonymy. Several collections of this species have accumulat-
ed in the Herbarium of the University of California from
various localities along the coast of central California.
These have been listed usually as Delesseria alata. Super-
ficially they resemble D. alata as found growing on the
coast of Europe, but the fronds are much narrower. I have
carefully compared the structure with that of a specimen
of D. alata distributed by Wyatt, no.14,from Torbay, on
the southern coast of England, which is probably as nearly
typical of the species as can be had, and found the histo-
logical characters to be decidedly different. The midrib
of the plant from Torbay is much larger, more complex; the
central filaments have cells much wider and many times
longer, and the cells of the alae are much smaller than
those in our plant.

TYPE OF:

ScxcueLL

VW*. (Uuf.	Y&*. -20^

XAVtgfL	Q&o'-j''

York

b°tanical

GARD&fV

NEW YORK

ALGAE DISTRIBUTED FROM THE	BOTANICAL

HERBARIUM OF THE UNIVERSITY OF CALIFORNIACrA/?DEN

266. Membranoptera Weeksiae Gardner

Near Cliff House, San Francisco, California.

N. L. Gardner, No. 4630. Aug. 1920.

Algae distributed from the Herbarium of
University of California

Mem branopt or; t ooltoiae iirctner

On .-Xisi ¡UrwSu¿a xatxjfrotus
Canne! -a;, # J&lifomia
December

H• Z* Sar&nor. J ? o. $335

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