forms
of _Tubulina caespitosa_ is very great.

2. CRIBRARIA VULGARIS, Schrad. Sporangium large, globose, stipitate,
somewhat cernuous; the calyculus brown, finely ribbed and granulose
within, occupying but a small part of the sporangium; the network of
slender threads, with very small nodules at the angles, each with
several (3-7) radiating threads, sometimes with one or two free
extremities, the meshes triangular or rhombic. Stipe rather short,
stout, tapering upward, usually a little bent or curved at the apex,
dark purplish brown in color. Spores in the mass pale ochraceous,
globose, even, 5-7 mic. in diameter.

Growing on old wood. Sporangium .5-.7 mm. in diameter, the stipe two or
three times the diameter of the sporangium in length. Recognized by the
large sporangium and the very small nodules with their few radiating
threads.

3. CRIBRARIA DICTYDIOIDES, C. & B. Sporangium large, globose, stipitate,
cernuous; the calyculus small, with thickish brown ribs, from which the
outer thin membrane often disappears soon after maturity; the network of
slender threads, with large brown nodules at the angles, more or less
elongated and irregular in shape, each with numerous (5-15) radiating
threads, usually some with free extremities, the meshes largely
triangular. Stipe long, tapering upward, flexuous, curved at the apex,
dark purplish-brown in color. Spores in mass pale ochraceous, globose,
even, 5-7 mic. in diameter.

Growing on rotten wood, especially of oak. Sporangium .5-.6 mm. in
diameter, the stipe from three to five times as long. This species
appears to be intermediate between _Cribraria vulgaris_ and _Cribraria
intricata_; the nodules are usually large and irregular, but the
characteristic parallel threads of _C. intricata_ do not often occur.
The outer membrane of the calyculus is by no means always absent.

4. CRIBRARIA ELEGANS, B. & C. Sporangium rather large, globose,
stipitate, somewhat cernuous; the calyculus thickly coated inside with
dark purple granules, faintly ribbed, occupying about a third part of
the sporangium; the network of slender threads, with large irregular
dark purple nodules, quite variable in shape and size, angular and
lobed, below sometimes much elongated, the meshes very irregular. Stipe
rather short, tapering upward, bent at the apex, dark purple in color.
Spores in the mass bright purple, globose, even, 5-7 mic. in diameter.

Growing on old wood. Sporangium .4-.5 mm. in diameter,