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R a c ib o e s k ia , Berl.
Sporangia naked, globose, stipitate, stem elongated, entering
the sporangium as a columella from one-third to half its height,
bearing at the apex secondary, short, slender columellas, these
in turn divide in a similar manner to the primary columella;
ultimate branches combined amongst themselves at every point
to form a network; extreme branchlets not free but arouately
comhined with each other.
Racihorskia, Berlese, Sacc., Syll., vii., pt. I., p. 400.
Rostafinskia, Racib., Myx. Crac., p. 9 (not of Spegazzini).
Bistrih. Poland. Species 1 .
Eaciborskia elegans, Berl.
Sporangia naked, globose, up to '5 mm. broad, stem erect,
1— 2 mm. high, thickest at the base, then subulate-attenuated,
plicate, black; columella half to one-third shorter than the
sporangium, cylindrical, 8— 10 g th ick ; capillitium hlackish-
violet, exterior threads exceedingly thin, not free; the extreme
branches furnished with scattered spines; spores 9 10 g
diameter, obscure violet, aculeate.
Racihorskia degans, Racib., Myx. Crac., p. 10, fig. 5.
Poland.
Raciborski considers that the present species is allied to
Rostafinski’s genus EcMnosteUmn. He also inclines to the idea
that the genus Orthotricha may prove to be identical with his
Racihorskia ( = Rostafinskia, Racib.).*
E chinostelium, De Bary.
Sporangia stipitate, columella absent, capillitium originating
from apex of stem, threads arcuate, combined to form a loose
network, furnished with numerous spine-like free arms.
Echinostdmm, De Bary, in Rost., Mon., p. 215; Cooke, Brit.
Myx., p. 5.3.
* Hedwigia, March and April, 1889.
Echinostelium minutum, De Bary (fig. 202).
Sporangia scattered, stipitate, globose, naked, whitish; the
arcuate threads of the capillitium springing from the apex of
the stem, furnished with numerous acute, free branches ; spores
coloured, 6'7—8'3 g diameter, smooth.
Echinostdmm minutum, De Bary, in Rost., Mon., p. 215,
figs. 53, 54, 58, and 68 ; Cke., Brit. Myx., figs. 53. 54, 58, 68 ;
Saco., Syll., vii., 1, no. 1340.
Orthotricha, Wingate.
Sporangium globose ; stipe elongated, entering the sporangium
as a very short or obsolete columella, and then dividing into
a few branches at a sharp angle. These branches fork several
times, thus forming a capillitium of straight threads. The last
branches meet at the surface of sporangium at a very sharp
angle by twos or threes, where they are joined together by
small membranaceous plates. Wall of the sporangium, with
the exception of the plates and a very small collar around the
stipe, not apparent.
Orthotricha, Wingate; Proo. Acad. Nat. Sci. Phil., 1886,
p. 125; Saco., Syll., vii., pt. I, p. 400.
Distrib. United States. Sp. 1.
Orthotricha microoephala, Wingate.
Sporangia globose, very variable in size, from one-twelfth to
one-fourth of a mm. in diameter; stipe elongated, brown or
blackish at the base, growing lighter towards the top, more
or less translucent, ten to thirty times the diameter of the
sporangium in height, tapering, rugose, except at the upper
part, where it more or less suddenly becomes a smooth filament,
entering the sporangium as a very short, sometimes almost
obsolete columella. I t then divides into a few (sometimes only
two) branches at a sharp angle. These branches fork several
times, forming a very loose capillitium of straight threads, the