was more recently (1896) again collected in Maine by the
late Professor Harvey.

_D._ PROTOTRICHIACAE

A single genus,--

=Prototrichia= _Rost._

1876. _Prototrichia_ Rost., _Mon. App._, p. 38.

A single species,--

1. PROTOTRICHIA METALLICA (_Berk._) _Mass._

PLATE XVIII., Figs. 12, 12 _a_, 12 _b_.

1860. _Trichia metallica_ Berk. Hook., _Fl. Tasm._, 2, p. 168.
1866. _Trichia flagellifera_ Berk. & Br., _Ann. Mag. Nat. Hist._, 3,
XVII., p. 56.
1876. _Prototrichia flagellifera_ (Berk.) Rost. _Mon. App._, p. 38.
1894. _Prototrichia flagellifera_ Rost., List., _Mycet. 2nd ed._,
p. 206.
1899. _Prototrichia flagellifera_ (Berk. & Br.) Rost., Macbr.,
_N. A. S._, p. 199.
1892. _Prototrichia metallica_ Mass., _Mon._, p. 127.
1911. _Prototrichia metallica_ Mass., List., _Mycet., 2nd ed._,
p. 260.

Sporangia sessile, scattered or sometimes crowded, brown, sometimes with
a rosy tinge, about 1 mm. in diameter; peridium a thin, transparent,
iridescent membrane, bearing in its inner surface the distal attachments
of the capillitial threads; capillitium of numerous brown, spirally
banded threads, which take origin in the base of the sporangium, become
subdivided as they ascend, and are at length attached by their tips to
the sporangium wall; spore-mass brown, spores by transmitted light pale,
minutely roughened.

This curious form, with its spirally sculptured capillitial threads
attached at both ends, stands intermediate between _Dianema_ and
_Hemitrichia_ and _Trichia_. Berkeley called it a trichia, ignoring the
attachment of the threads. Cooke notes this as sufficient to exclude the
form from the genus. But it remained for Rostafinski to make the
transfer by setting up for its reception the genus now adopted. He
preferred the later (1866) specific name as more descriptive. Miss
Lister reverts to the earlier name with the remark; "Little now remains
of the type _Prototrichia metallica_ Berk. from Tasmania; but the
specimen is referred to _Prototrichia flagellifera_ by Rostafinski who
saw it in good condition."

Not uncommon in the abietine forests of the West. Alberta, Oregon,
Washington, California, Nevada, Montana, Idaho, Colorado.

_E._ TRICHIACEAE

Capillitium marked by spiral bands, sometimes scattered rings, etc., the
threads entirely free, or at least loosely branched, and with free tips
more or less numerous.

=Key to the Genera of the