Ulvella prostrata N.L.Gardner

• Region

  North America

• Country

  United States of America

• State/Province

  California

• County/Municipio

  San Francisco Co.

• City/Township

  San Francisco

• Locality

  Land's End, epiphytic on Iridaea laminarioides Bory

• Coordinates

  37.7833, -122.502

• Coordinate Uncertainty (m)

  1441.57

• Georeferencing Method

  Georeferencing Quick Reference Guide, Version 2012. Located coordinates of geogr. center of Land's End. Measured from coord. to farthest extent of the park to find linear extent (1430 m). Input info. into MaNIS Georef. Calc. to find uncert. rad. (Bounded Area).

• Geodetic Datum

  WGS84

• Distribution

  Map all specimens of this taxon

NEW YORK
botanical	EXAMINATION OF PLATE 14.
0*4 ]*£& fitty
Ulvella -prostrata Gardner sp. nov.
1.	Showing a small section of the margin of the thallus on the surface
of iridaea laminariohles.
2.	A cross-section of fig. 1, perpendicular to the long diameter of the
filaments of Ulvella.
-ftJUku if
Ulvella prostrata Gardner, sp.nov.
Univ.Calif.Publ.Bot.3:373. 26 Ap 1909,
Thallus epiphyticus e filamentis articulatis, ramosis,
et radiantibus, intus 2-3 stratosus et filamentis plus
minusve coalitis sed margine 1-stratosus filamentis liberis
divergentisque, ad thallum hospitis arote adhaerens. Fila-
mentis 6-7)i latis, in diametro aequalibus per totam longitud-
inem; cellulis centralibus subquadratis; peripheralibus 1^-2%-
plo longioribus. Chlorophora singula pyrenoide una in cellula
quaque. Trichomata et oellulae longe attenuatae desunt.
2oosporangia ignota.
Thallus epiphytic, consisting of two or three layers
of cells in the center, but of a single layer at the margin,
formed by branching filaments, coalescing in the center of
the thallus but free at the margin, spreading out radially
and adhering very firmly to the host; filaments branched,
6-7u in diameter and nearly uniform in size throughout their
entire length; cells quadrate in the center of the thallus,
those at the outer ends of the filaments 1^ to 2-J- times as
long as broad; color very dark green; end cells blunt; a
single band-shaped peripheral chromatophore containing one
pyrenoid in each cell; no hairs or tapering cells.
Observed in a single locality, viz.,at land's End,
San Francisco, California. Strictly epiphytic on Iridaea
laminarioides, usually on the sterile part of the frond,
forming obscure circular cushions 2-3 mm. in diameter.
(Plate 14, figs. 1 and 2.)
Nothing has been ascertained in regard to methods
of reproduction, and until more can be learned the
systematic position of this plant will have to remain
somewhat in doubt, it seems to belong in Mycoideaceae
as diagnosed by Wille in Engler & prantl*s natürlichen
Pflanzen Familien and is closely related to pringsheimia,
from which it differs in being more than a single layer
of cells thick. Mycoidea has hairs and no pyrenoids.
Phycopeltis has no hairs and no pyrenoids but has
" Haematoohrom w and is only one layer of cells thick.
The cells of the uppermost layer in the center of the
thallus probably form sporangia, since in some cases
they have been observed to be somewhat enlarged. It
differs from Ulvella lens Crouan in the smaller size
of its filaments and from U. fucicola Rosenvinge which
it resembles most closely, in its being composed of
fewer layers.
The New York Botanical Garden
/ft£
NEW YORK BOTANICAL GARDEN
02140718
02140718