Myrionema secundum f. majus Setch. & N.L.Gardner

• Region

  North America

• Country

  United States of America

• State/Province

  California

• County/Municipio

  Monterey Co.

• Locality

  Carmel Bay,

• Coordinates

  36.5447, -121.931

• Coordinate Uncertainty (m)

  4511.57

• Georeferencing Method

  Georeferencing Quick Reference Guide, Version 2012. Located coordinates of geogr. center of Carmel Bay. Measured from coordinates to farthest extent of the bay to find linear extent (4500 m). Input information into MaNIS Georef. Calc. to find uncertainty radius (Bounded Area).

• Geodetic Datum

  WGS84

• Distribution

  Map all specimens of this taxon

Myrionema foecundnra f. ma jus Set cheli & Gardner, forma nov.
Univ.Calif.Pubi.3ot.7 : 338.pi.32.f.7. 16 My 1922.

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Frondibus pulvinulos orbiculares, 1-2 mm. diam.,
superficie superiore convexa; parte prostrata filamentis
arete adhaerantibus, regulariter radiantibus composita;
filamentis erect is dense stipatis, simplicibus, cellulis
cylindricis, 5-7 ji diam. ; pilis veris sparsis, per frondem
promiscue distributis, basim meristematicis, vaginatis, 400-
500 y longis, celluli3 6 ji diam. apice, 5-8-plo longioribua;
"ascocystis " in filamentis prostratis sessilibus, cylindricis,
apice leviter distentis, 45-55 ji longis, 8-12 p. latis, nunc
in fronde tota sparsis nunc in gregibus isolatis; zoosporangi is
ignotis; gametangiis in filamentis basalibus sessilibus, cylin-
dricis, 60-80 ji longis, 6-8 y. latis, per transformationem quis-
que toti filamenti oriendis, dissepiment is horizontalibus aut
obliquis.

Growing on Laminaria ephemera Setchell. Port Renfrew,
Vancouver Island, ITeah Bay, Puget Sound, (Tacoma) and central
California (Carmel Bay). Type, Gardner, no. 2910 (Herb. Univ.
Calif., no. 207013), Carmel Bay, California, May.

Thi3 small epiphyte seems to be restricted in it3 habitat
to the above named host. The only known localities in which the
host has been observed are those mentioned above. The material
from each locality is richly infested by this epiphyte. The
host, richly infested, was distributed by Miss Josephine Tilden
in her American Algae (Exsicc.), no. 609, under Renfrewia parvula
Griggs.

Tt seems very closely related to Myrionema foecundum f.
simplicissimura. The differences are in the larger measurements
of all of the parts, the presence of numerous, larger, so-called
ascocysts, occurring in groups (see plate 32, figure 7), or
scattered among the gametangia, in the presence of well develop-
ed hairs, and in the more convex upper surface of the mass of
erect filaments.

Myrionema foecundum f. ma jus S. and G. \

Fig. 7. A terminal part of a creeping filament showing a group
ascocysts, true hairs, and typical gametangia. X 250.

( £ 'à'V

of so-called

Setchell, W. A. 8t Gardner, M. L. MelanoDhyceae
Univ. Calif. Pubi. Bot. 8: 463, 1925

1925]

Setchell-Gardner: Melanophyceae

463

9. Myrionema foecundum f. majus S. and G.

Fronds forming circular cushions, 1-2 mm. diam. with convex
upper surface; prostrate portion composed of closely adhering, regu-
larly radiating filaments; erect filaments densely crowded, unbranched;
cells cylindrical, 5-7/a diam.; true hairs sparse, distributed promiscu-
ously over the frond, meristem at the base, surrounded by a sheath,
400-500/* long, cells 6/a diam., 5-8 times as long as the diameter at
the apices; “ascocysts” sessile on the prostrate filaments, cylindrical,
slightly larger at the distal end, 45—55/x long, 8-12/a diam., scattered
sparsely over the frond, occasionally in groups; zoosporangia un-
known ; gametangia sessile on the basal filaments, cylindrical, 60-80/1
long, 6-8/a diam., arising by transformation of all of each erect
filament, cross-walls horizontal or oblique.

Growing on Laminaria ephemera Setchell. Port Renfrew, Van-
couver Island, Neah Bay, Puget Sound and central California (Carmel
Bay).

Setchell and Gardner, Phyc. Cont. II, 1922, p. 338, pi. 32, fig. 7.

This small epiphyte seems to be restricted in its habitat to the
above named host. The only known localities in which the host has
been observed are those mentioned above. The material from each
locality is richly infested by this epiphyte. The host, richly infested,
was distributed by Miss Josephine Tilden in her American Algae
(Exsicc.), no. 609, under Renfrewia parvula Griggs.

It seems very closely related to Myrionema foecundum f. simpli-
cissimum. The differences are in the larger measurements of all of
the parts, the presence of numerous, larger, so-called “ascocysts,”
occurring in groups, or scattered among the gametangia, in the
presence of well-developed hairs, and in the more convex upper'
surface of the mass of erect filaments.

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