Dean—The Myxomycetes of Wisconsin. 
1247 
cate, sparingly branching or anastomosing threads! perpendicular 
to the columella; spores black in mass, by transmitted light violet 
tinted, smooth, 6-S/x.” He calls this our most common species, 
recognized by its rather large, white, depressed or flattened spor¬ 
angia tending to form reticulations. He says the lines of fruit¬ 
ing tend to follow the venation of the supporting leaf; when the 
sporangium is round, the columella is a distinct rounded or cake¬ 
like body; when the fruit is venulose, the columella is less dis¬ 
tinct. 
Lister gives the synonym D . reticulatum to the form which he 
calls D. effusion, and refers to D. effusum as described by Mac- 
bride, and also to the form which Macbride calls D. reticulatum, 
as though the two forms were included in his one D. effusum. 
Macbride makes the two names apply to two distinct species, and 
says that D effusum “might be taken for an exceptionally plas- 
modic form of D. reticulatum but is distinguished by the ex¬ 
treme thinness of the fructification and its pure white color; it 
looks like a splash of whitewash. ’ ’ He gives the diameter of the 
spores of D. effusum, as 3-10y, whereas those of D. reticulatum 
are 8-8y. 
Massce adopts the name CJt rondrioclerma reticulatum , Rost. He 
says: “Plasmodium sessile, vein-like, flattened, arcuate, com¬ 
bined into an irregular network, seated on a whitish, delicate, 
reticulated, spreading hypothalius; columella absent; threads of 
eapillitium colorless, very thin, combined to form a dense net; 
spores smooth, obscure violet, 7-3y in diameter/’ 
Macbride’s description is excellent for the specimens that I 
have, although I do not find them “following the venation of 
the supporting leaf.” The inner peridium in some of mine has 
a tinge of brown, while others are ashen or bluish on the same 
leaf. The spores I find to be smooth, 6-3 y in diameter. 
I have many groups on several kinds of both living and dead 
leaves, which I collected at Blue Mounds, July 23, 1904; some 
on dead oak leaves from Cemetery woods, July 21, 1904; and 
some on both living and dead leaves from Vilas w r oods, July 18, 
1904, 
