Janczewskia gardneri Setch. & Guernsey

NEW YORK BOTANICAL GARDEN
HEW YORK
botanical
g a r ?
NEW YORK BOTANICAL GARDEN
02215576
Algae distributed from the Herbarium of the
University of California
Janczawskia Gardneri Setchell
Bolinas,Marin Co , Cklif.
W..A. Setchell Oct. 1919
NEW YORft
BOTANICAL
CARDEN
NEW YORK
^ Herbarium op the University or Caufokni^^piic&
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G. Hansen (HMSC) - Nov. 1999
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NEW YORK BOTANICAL GARDEN
02215578
janczewskia Gardneri Setchell et Guernsey gp. nov\i
Pi .1,figs.4-6;pi*3,figs.15,16;pl.5, fig.Sk.	j
>Univ. California Publ.Bot* 6;12.18 Ap 1914,^^
V'
J. verruoaeformis lott, Erythea, vol.5, p. 83, 1897;
Setchell in Collins, Holden and Setchell,phyc.Bor.-
Ato.,Fasc.l8, no* 887, 190l;Setchell & Gardner,Univ.Calif.
Pub. Botany, vol.l, p. 386, 1903 (not of Solms-Laubach.)*
Parasitic on Laurenoia pinnatifida, this species forms
large, irregular masses of a light pinkish tint on all
portions of its host, its shape being much more irregulai
than that of any other species, due partly, perhaps, to
the flattened stems and branches of the host plant, it
may occur on one surface, in which case the flattened hoi*4L
is bent back from it, sometimes even to a right angle,or
it may also occur on the short and almost cylindrical
branchlets of the host with little if any bending, it
often partially encircles the host plant.
The penetration of the host takes place by means of
slender hyphal branches which penetrate to the central
elongated cells of the host and often form masses in
th,e intercellular jelly. At the regions of penetration
the epidermal cells of the host elongate in the anti-
clinal direction to twioe their length and become less
than half their normal width,thus producing a conspicuous
palisade-like layer.
The tetrasporic plant is the largest,at least among
those observed by the writer, reaching 10 mm. in its
greatest diameter?ordinarily, however, as much as 8 mm.,
and is a more or less flattened cushion (pl.l, fig.5),
covered with slender, free branches projecting as much
as, or a little more than,2 mm. These free branches are*
blunt, of-equal diameter throughout, and simple. The
antheridial plant is usually much smaller, about 4 mm.
in greatest diameter, more nearly globular or somewhat
flattened (pl.l, fig.6;pl.3, fig.16), more or less mori- \
form, with the crowded short free branches which are 0.6--!
0.8 mm. long and slightly enlarged, above in fertile con-
dition. The cystocarpic plant (pl.l, fig. 4; pi. 3, fig.
15) is nearly?as large as the tetrasporic, reaching a
greatest diameter of 8-9 mm., iff flattened and irregular,
with its crowded free branches 1.0~1.5 mm long and mote
or less swollen above at maturity of the cystooarp?, '
which two frequently occupy the same summit.
The tetrasporangia are tripartite and subepidermal
tbhe outer surfaces of the free branches. The anther-
a occur in almost globose or ellipsoidal conceptacles
Ing the entire inner surface. They occur in closely
wded, elongated, simple plumes which project inwards
[Irds the center (pi. S,fig. 25).? They are ifi structure
larrangement very similar to those of J. moriformis,
IIthey are more slender and more crowded.
I The cystocarps occur singly or in twos at the!t$ps
[Bbhe fretf branches. The walls are moderately thick
lithe spores and sporiferous filaments are more slender
||more crowded than in any of the preceding species.
i| Janczewskia Gardner! differs from J. moriformis in
IJuniformly greater length of the free branches and in
I dimensions and abundance of the antheridial plumes
f the sporogenous tissues in the cystocarp.
Jancxewskia Gardneri is found on laurenoia pinnati-
Ż, particularly on that broad, coarse form called
Bpeotabilis by Postels and Rupreoht. it has been
jlected on Vancouver Island, B.O. ,by John, Macoun;
at Whidbey island.Washington, and near San Francisco,
Pacific Grove and San Pedro.California, by U.L.Gardner;
at Fort Ross (of.Phyc.Bor.Am.,no. 887) and about San
FrancIbco, California, by the writer; and at Monterey