Rhodochorton amphiroae K.M.Drew

• Region

  North America

• Country

  United States of America

• State/Province

  California

• Locality

  White's Point, West of San Pedro.

• Coordinates

  33.7153, -118.317

• Coordinate Uncertainty (m)

  301.569

• Georeferencing Method

  Georeferencing Quick Reference Guide, Version 2012. Located coordinates of geogr. center of White Point. Measured from coord. to farthest extent of the point to find linear extent (290 m). Used MaNIS Georef. Calculator to find uncertainty (Bounded Area).

• Geodetic Datum

  WGS84

• Distribution

  Map all specimens of this taxon

? YORK
.CAL

y i fr “rT i

UNIV. CALIF. PUBL. BOT. VOL. 14

[DREW] PLATE 40

Bhodochorton Amphiroae sp. nov.

Fig. 34. Sketch of the host, Amphiroa sp., showing the epiphyte growing in
the nodal grooves. Approximately X 3.

Fig. 35. Part of a plant showing the somewhat tortuous nature of the
filaments. X 160.

Fig. 36. Monosporangia-bearing part of a filament enlarged. Note the
irregular branching and the parietal band-shaped chromatophore. X 700.

Fig. 37. Endophytic filament penetrating between the elongated cells of
the node of Amphiroa. X 700.

\

f

BT'?W

Herbarium of the University of California

ïâ

AIiGÆ OF

1

(0W-

RhocLochorton Amphiroae Drew,sp.nov. p. 179.
Univ.Calif.Pubi.Bot.14-.pl.40.f.34-57* 4 F 1928.

Plants endophytic.forming tufts 1-2 mm. long in the
nodes of the frond of the host; base a mass of entangled
filaments growing over the surface and penetrating be-
tween the nodal cells of the host; endophytic filaments
short, growing parallel to the surface of the host;
branching of the erect filaments very irregular but more
or less unilateral, branchlets scattered irregularly and
often branched on the adaxial side ; cells cylindrical,
12.0-14.0 u diam., 1-J--3 times as long; chromatophore
parietal, with one pyrenoid embedded in it usually toward
the apical end of the cell; monosporangia terminal and
lateral on the branchlets, sometimes so abundant as to
form dense clusters, ovoid 10.0-13.0 )i by 16.0-19.5 ;
chromatophore of the sporangium apical, with one pyrenoid.

Hosts,two forms of Amphiroa tuberculosa, white's
Point, San Pedro, California. February. Type, Herb. Ufciv.
Calif, no.276411 (Gardner, no.1928) from the locality
already mentioned.

This appears to be the first species reported for
this host or any other genus of the Corallinae. The spores
lodge in the grooves between the joints of the host and
germinate,there, the mass of entangled basal filaments
finally filling up the entire groove or node.

It was diffioult to determine whether R. Amphiroae is
endophytic or not but sections indicate that some of the
basal filaments wedge themselves in between the elongated
nodal filaments of the Amphiroa and continue to grow parallel
with them, at the same time forcing them apart (fig.37). The
endophytic filaments never penetrate to any great depth.

In one or two instances hair-like terminations of the
branches have been seen. It is possible that they occur
more frequently, but it is difficult to demonstrate their
existence with dried herbarium material.

SOTYPE

.A . LO

0 1	2	3 4	5	6 7 8	9 10	The New York
cm				copyright reserved		Botanical Garden

00900663