_Tremellini._

II. Hymenium enclosed in a peridium, ruptured when
mature GASTEROMYCETES.
Hymenomycetous--
Subterranean, naked or enclosed _Hypogaei._
Terrestrial, hymenium deliquescent _Phalloidei._
Peridium enclosing sporangia, containing spores _Nidulariacei._
Coniospermous--
Stipitate, hymenium convolute, drying into a
dusty mass, enclosed in a volva _Podaxinei._
Cellular at first, hymenium drying up into a
dusty mass of threads and spores _Trichogastres._
Gelatinous at first, peridium containing at length
a dusty mass of threads and spores _Myxogastres._

III. Spores naked, mostly terminal, on inconspicuous
threads, free or enclosed in a perithecium CONIOMYCETES.
Growing on dead or dying plants--
Subcutaneous--
Perithecium more or less distinct _Sphaeronemei._
Perithecium obsolete or wanting _Melanconiei._
Superficial--
Fructifying surface naked.
Spores compound or tomiparous _Torulacei._
Parasitic on living plants--
Peridium distinctly cellular _AEcidiacei._
Peridium none--
Spores sub-globose, simple or deciduous _Caeomacei._
Spores mostly oblong, usually septate _Pucciniaei._

IV. Spores naked, on conspicuous threads, rarely
compacted, small HYPHOMYCETES.
Fertile threads compacted, sometimes cellular--
Stem or stroma compound--
Spores dry, volatile _Isariacei._
Mass of spores moist, diffluent _Stilbacei._
Fertile threads, free or anastomosing--
Fertile threads dark, carbonized--
Spores mostly compound _Dematiei._
Fertile threads not carbonized--
Very distinct--
Spores mostly simple _Mucedines._
Scarcely distinct from mycelium--
Spores profuse _Sepedoniei._

DIVISION II. SPORIDIIFERA. _Sporidia in Asci._

V. Fertile cells seated on threads, not compacted into
a hymenium PHYSOMYCETES.
Threads felted, moniliform--
Sporangia