in,
yellow, shining, punctulate or minutely granulose. Mass of spores and
capillitium yellow; elaters simple or sometimes branched, 3-4 mic. in
thickness, sometimes with thicker inflated portions; the surface
punctulate or minutely warted, occasionally marked with very faint
spirals; the extremities usually rounded and obtuse, sometimes acute,
and rarely with a minute apiculus. Spores angularly or irregularly
globose, the surface reticulate, 11-14 mic. in diameter. See Plate I,
Fig. 24.

Growing in dense patches on old wood and mosses. Sporangia .4-.6 mm. in
diameter, and reaching 1 mm. in height, the elaters usually rather long,
sometimes quite long and branched.

4. OLIGONEMA BREVIFILA, Peck. Sporangia subglobose, irregular, sessile,
crowded, forming clusters or effused patches; the wall thin, yellow,
densely granulose and venulose. Mass of capillitium and spores
ochre-yellow; elaters simple or sometimes branched, often very short and
fusiform, when elongated having long tapering extremities, sometimes
with irregular swollen portions; the surface minutely granulose and
rugulose, here and there a few spinules, occasionally with indistinct
spirals. Spores angularly or irregularly globose, the surface
reticulate, 11-12 mic. in diameter.

Growing on old wood and mosses. Sporangia .4-.5 mic. in diameter, the
elaters varying greatly in length, some not more than 20 or 30 mic.
long, others more than 100 mic. in length.

_B. Spores minutely warted._

5. OLIGONEMA FULVUM, Morgan n. sp. Sporangia rather large, subglobose,
sessile, closely crowded and more or less irregular; the wall tawny
yellow, very thin and fragile, smooth, shining and iridescent. Mass of
capillitium and spores tawny yellow; elaters simple or sometimes
branched, mostly very short, 4 mic. in thickness, sometimes with thicker
swollen portions; the surface marked with low smooth spirals, in places
faint and obsolete; the extremities rounded and obtuse, usually with a
very minute apiculus, 1-3 mic. in length. Spores globose, minutely
warted, 10-13 mic. in diameter.

Growing on an old effused Sphaeria. Sporangia .6-.8 mm. in diameter, the
elaters mostly 40-80 mic. in length, rarely much longer and sometimes
shorter; the longer elaters and those that are branched often arise from
confluence of the shorter ones.

EXPLANATION OF PLATE I.

Fig. 13.--Perichaena depressa, Lib.

Fig. 14.--Ophiotheca Wrightii, B. & C.

Fig. 15.--Lachnobolus globosus, Schw