s peculiarity did not escape the
attention of Persoon, and is well shown in his figure (_Obs. Myc._, I.,
p. 58, pl. V. Figs. 4 and 5) referred to by Gmelin, _l. c._ Batsch
simply named and described Micheli's figure (Tab. XCIV., Fig. 2), and
accordingly his claim to priority is no better than Micheli's figure,
which may possibly concern the present species, but is in no sense
determinative. It is impossible to say what Retzius meant by his
_Clathrus ramosus_, cited by Fries as a synonym here.

Common, especially in the Mississippi valley and south; more rare in the
west; Black Hills, South Dakota; Toronto to New Mexico.

6. ARCYRIA NODULOSA _Macbr._

PLATE III., Fig. 8.

Sporangia small, about 1 mm. high when unexpanded, crowded in clusters
of varying size, dull red or brownish, stipitate; the peridium
evanescent except the cup; stipe very short, concolorous, plicate as the
cup, or both smooth and unmarked; capillitium centrally attached, slowly
expanded, open-meshed, dense, the threads even, 5-6 mu wide, expanded in
globose, spinulose, or papillate-reticulate nodules, especially at
points of intersection, marked everywhere by close-set, transverse,
sharp-edged ridges, which encircle the thread and show no trace of
spiral arrangement; spore-mass brown or red brown; spores by transmitted
light pale yellow or colorless, minutely but distinctly roughened,
globose, 10-12 mu.

This variety is not distantly related to the preceding, as shown by the
centrally attached capillitial mass, but differs in several definite
particulars; the sporangia are much smaller of an entirely different
color with longer stipes, larger, rougher spores; the capillitium is
also peculiar, the threads unusually wide and densely corrugated
transversely, expanding at frequent intervals into globose nodules which
are sometimes double the width of the thread. In color suggests _A.
affinis_ Rost., but corresponds to no other particular.

7. ARCYRIA FERRUGINEA _Sauter._

PLATE XII., Figs. 6, 6 _a_, 6 _b_.

1841. _Arcyria ferruginea_ Saut., _Flora_, XXIV., p. 316.
1881. _Arcyria macrospora_ Peck, _Rep. N. Y. Mus._, XXXIV., p. 43.
1883. _Arcyria aurantiaca_ Raunier, _Myx. Dan._, p. (44).

Sporangia ovoid or short cylindric, crowded or gregarious, dull red or
brownish, stipitate; stipe about equal to the sporangium, dark brown or
black; hypothallus well developed, membranous, yellowish brown
continuous; calyculus large, wide and shallo