porangia scattered, seldom crowded, obovoid or turbinate, olivaceous
yellow, stipitate; the peridium smooth without, granulose within,
evanescent above, persisting as a funnel-shaped cup below; the stipe
long, reddish or blackish, rising from a small hypothallus; capillitium
of threads 5-6 mu thick, very much branched, forming a dense net, free
ends none, or not evident; the sculpture as in _H. clavata_, smooth and
regular; spore-mass yellow; spores by transmitted light yellow, minutely
warted, 7-8 mu.

This form corresponds in nearly every respect with _H. clavata_, except
in the structure of the capillitium. The color is rather ochraceous,
dirty yellow, and the stipe is proportionally longer and darker, but the
form of the net is positive and gives to the species a decidedly
striking and unique appearance, so that it may be recognized by the
naked eye. It looks like an arcyria and for this reason Professor Morgan
said _H. plumosa_. Lister regards it as the same as our number 8.

Common. Ohio, Illinois, Missouri, Iowa, and west; south to Mexico.

10. HEMITRICHIA MONTANA _Morgan._

Sporangia scattered or gregarious more or less closely, globose,
whitish, sessile or very short stipitate; the peridium opaque, dull
white, persistent below; capillitium deep yellow, the threads abundantly
branched, forming a compact network, 7 mu wide, bearing spirals five or
six, uneven and irregular, or anon interrupted, conspicuously spinulose
or warted, free tips not lacking, generally inflated; spore-mass yellow,
spores by transmitted light pale, nearly colorless, distinctly warted,
10 mu.

Recognizable by its peculiar pallid, sessile sporangia, as by the
internal structure. Perhaps related to _Hemiarcyria bucknalli_ Mass. Our
specimens are from Mr. Morgan, of Ohio, with the statement that they
were collected in the San Bernardino Mountains, California, by Mr. S. B.
Parrish; collected later from Monterey south.

Common throughout south-western states to lower California.

=2. Calonema= _Morgan._

1893. _Calonema_ Morgan, _Jour. Cin. Soc._, p. 33.

Sporangia sub-globose, crowded or superimposed, irregular sessile;
hypothallus none; capillitium of slender tubules, arising from the
sporangium base, branched, marked with branching veins in an irregular
reticulation, and terminating in free extremities. Spores yellow.

1. CALONEMA AUREUM _Morgan._

PLATE XIII., Figs. 2, 2 _a_, 2 _b_, 2 _c_.

1893. _Calonema aureum_