932 The American Naturalist. [October, 
Subclass IlA—ENDOSPORE. Spores developed inside the spor- 
angium. 
Cohort I—AMAUROSPORALES. Spores violet, or violet-brown, ex- 
cept in Stemonitis and Comatricha, in a few species of which they are 
pale ferruginous. 
Subcohort I.—CALCARINEÆ. Sporangia provided with lime (cal- 
cium carbonate). 
Order I.—Physaracee. Lime in minute innate granules. Gen. 
Badhamia, Physarum, Fuligo, Cienkowskia, Physarella, Craterium, 
Leocarpus, Chondrioderma, Trichamphora, Diachea. 
Order II.—Didymiaceæ. Lime in crystals. Gen. Didymium, Spum- 
aria, Lepidoderma. 
Subcohort II. —AMAUROCHÆTINE®. Sporangia without lime. 
Order I.—Stemonitacez. Sporangia simple. Gen. Stemonitis, Com- 
atricha, Enerthenema, Lamproderma, Clastoderma. 
Order II.—Amaurochætaceæ. Sporangia combined into an æthal- 
ium, Gen. Amaurochete, Brefeldia. 
Cohort II.—LAMPROSPORALES. Spores variously colored, never 
violet. 
Subcohort L—Aneminex. Capillitium wanting, or not forming a 
system of uniform threads. 
Order I.—Heterodermacee. Sporangium-wall membranous, beset 
with microscopic round granules, and (except in Lindbladia) forming 
a net inthe upper part. Gen. Lindbladia, Cribraria, Dictydiwm. 
Order II.—Liceacee. Sporangium-wall cartilaginous; sporangia 
solitary. Gen. Licea, Oreadella. 
Order III.—Tubulinacee. Sporangium-wall membranous, without 
granular deposits; sporangia tubular, compacted. Gen. Tubulina 
Siphoptychium, Alwisia. 
_ Order IV.—Reticulariaceæ. Sporangia combined into an æthalium, 
the sporangium-wall incomplete, perforated or forming a spurious 
eapillitium. Gen. Dictydiethalium, Enteridium, Reticularia. 
Subcohort II.—CALONEMINE®. Capillitium present, a system of 
uniform threads. 
Order I.—Trichiacex. Capillitium consisting of free elaters, or 
combined into an ‘elastic network with thickenings in the form of spirals 
or complete rings. Gen. Triehia, Oligonema, Hemitrichia, Cornuvia. 
Order II.—Arcyriaceæ. Capillitium combined into an elastic net- 
work with thickenings in the form of cogs, half rings, spines, or warts 
(scanty and often reduced to free threads in Perichena corticalis). Gen. 
Arcyria, Lachnobolus, Perichena, 
