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A MONOGRAPH OF THE GENUS PODAXIS DESV. (= PODAXON FR.). G9
Westeniess, Port Appiu, 1885, ('. Bailey; Dumbarton, Kilpatrick
Hills, 1889, L. Watt, comm. A. Bennett; Kerry S., Caragli Lake,
1889, n. TC. Scully.
var. crassa. — Westmoreland, Grasmere, 1884, T. A. Cotton,
comm. A. Bennett.
N. OPACA A(i.— Keni W., 1888, J. Cr.; Renfrew, 1887, U. Kidstnn;
Selkirk, 1876, A. Cnd;/ Vhyhtie, herb. Bom-ell; Haddington,
18G1, ./. T. Boswell, lu-rb. Bo'stcell ; Kincardine, 1800, ./. B. Syme,
herb. Bosurll.
Explanation of Pl.\te 296. a, NitellaNordstedtiana, nobis; \i\&nt natural
size, from specimen in Dr. Ward's herbarium, b, Branch, from specimen sent
to us fresh by Mr. A. Bennett, c, Ditto, x 19. d, End-segments of fertile
branchlets, x 15i». e, Fruiting branchlet, x '^2. f, Fruit, x 00. o, Oospore,
X GO. H, Part of surface of oospore, x 375 (after photo, by J. Guardia).
I, Forking, with antheridium and young fruit, x 60. k, N. tenutusima, Kuetz.
end-segments of fertile branchlets, x 150. l, Ditto, oospore, x 60. m, Ditto,
2)art of surface of oospore, x 375 (after photo, by J. Guardia).
A MONOGRAPH OP THE GENUS PODAXIS Desv.
(= PODAXON Fr.).
By George Massee.
(Concluded from p. 39.)
Affinities.
From -what lias already been said, it will be seen that we are
dealing with a genus showing considerable latitude in the mode of
spore-formation, in the most typical species the spores arc produced
as asci of peculiar form and mode of arrangement, and in searching
for homologous structures we find the nearest approach in the
subterranean fungi constituting the Hypoyai, which are divided into
three groups, the Ilyviennyastirte, or basidiosporous division ; the
Tiiberaeete, characterized by having the spores produced in asci
and the I'Jlaphomycetec, also ascigerous, but so evidently distinct in
many important points from the Tuberacea: that Tulasnc considered
the division of ordinal value, and expressed his views as to its
relative position as follows:— "Elaphomycetes Tuberaceis genuinis
quoad fructificationem aualogi, struct ura morphosisque tloccosopulveracea
sicca ab eis toto coclo differuiit et ad Lycopcrdeos
basidiosporos accedunt, qua propter fungus ulriusque familiie medii
connectere videntur."*
Tiie Klapliuwyceta', as already stated, are truly ascigerous, by
wliicli I mean that one or more spores produced by free celllormation
appear in a mother-cell, from which they eventually
escape, the wall of the mother-cell forming no part of the walls of
the daughter cells, but remaining usually for some time in a
'Fungi Hypogni,' p. 101.