orangium with the stipe
4-10 mm. in height, the sporangium .3-.4 mm. in thickness, the stipe
much shorter than the sporangium. The meshes of the superficial network
varying from 6-30 mic. or sometimes from 10-40 mic. in width, according
to the specimen. The species is certainly rare in this country, and my
description is drawn up from British specimens. But I am unable to
distinguish authentic specimens of _Stemonitis herbatica_, Peck, from
these British specimens.

Sec.2. MEGALODICTYS. Threads of the capillitium arising from rather distant
points of the columella, branching and anastomosing but a few times,
thus forming an interior network of very large meshes; the superficial
network consisting of large irregular meshes, varying from three or four
to many times the diameter of the spores.

5. STEMONITIS WEBBERI, Rex. Sporangia subcylindric, the apex obtuse,
tapering gradually downward, growing close together on a common
hypothallus. Stipe and columella black and smooth, the stipe very short,
the columella extending nearly or quite to the apex of the sporangium,
the upper part usually flexuous. Capillitium composed of slender,
flexuous brown threads; these immediately branch and anastomose several
times, forming an interior network of very large meshes; the superficial
network consisting of large irregular meshes, sometimes much elongated.
Spores globose, very minutely warted, brown, 7-9 mic. in diameter. See
Plate XI, Fig. 34.

Growing on old wood, bark, etc. Sporangium with the stipe 5-10 mm. in
height, the stipe 1-2 mm. in length, the sporangium .3-.4 mm. in
thickness; meshes of the superficial net of the capillitium 40-100-150
mic. in extent. This is a much smaller species than _Stemonitis
splendens_, and the structure of the interior network of the capillitium
is entirely different.

6. STEMONITIS SPLENDENS, Rost. Sporangia linear-cylindric, obtuse at the
apex, growing close together on a conspicuous hypothallus. Stipe and
columella black and shining, the stipe very short, the columella
reaching nearly or quite to the apex of the sporangium, often flexuous
above. Capillitium composed of brown threads, variable in thickness,
often with membranaceous expansions; the primary branches some of them
simple or only branched above, others with a few anastomosing
branchlets, forming an interior network of extremely large meshes; the
superficial network consisting of large, irregular, roundish or
polygonal meshes. Spor