OE.THOTRICHUM D r u m m o n d i i .
Drummond's Orthotrichum.
C l a s s a n d O r d e r CRYPTOGAMIA MUSCI, Linn N a t . O r d . MUSCI, Juss.
De Cand. Hook.
G EN E R IC CHARACTER.
Seta terminalis. Peristomium plerumque-duplex; ext. e dentibus \6 per paria
vel unitis vel approximatis; int. e membrana lacerata erecta, aut ciliis 8-16
vel nullis. Calyptra mitriformis.—Columella non capitata.
Seta terminal. Peristome mostly double; ext. one of 16 teeth approaching
or united in pairs ; int. one of an erect lacerated membrane or 8-16 ci-
liiE, or wanting. Calyptra mitriform— Columella not capitate.
S P E C IF IC CHARACTER.
O r t h o t r i c h u m Drummondii; oblongo-lanceolatis subcrispatulis; seta
elongata; theca clavata, sulcata; operculo longe rostrata; peristomio sim-
plici e dentibus 16 reflexis, basi liberis, sed per paria apicibus plerumque
unitis ; calyptra valde pilosa.
O. leaves oblong-lanceolate, slightly crisped; seta elongated; theca clavate,
furrowed; lid with a long beak; peristome simple, of 16 reflexed teeth,
free at their base, but mostly united in pairs at their extremities; calyptra
very hairy.
O r t h o t r i c h u m Drummondii, Hook. Sf Crev. MSS.
H a b . Trunks of trees. Glen Fallach, Messrs H o o k e r , A r n o t t and G r e v
i l l e . Near Forfar, abundant, Mr D r u m m o n d . Angusshire and Perthshire,
Mr M a c v i c a r .
Stems somewhat creeping, 1-2 inches in length; branches rather short, erect,
tufted, mostly very dark coloured except at the summits. Leaves oblong-
lanceolate, somewhat carínate and recurved at the margin, slightly crisped
when dry. Seta elongated, twisted. Theca long, clavate, deeply sulcate.
Lid conical, with a long beak. Peristome simple, of 16 linear-
lanceolate, reflexed teeth, marked by a longitudinal line, free at their
base, but mostly united in pairs at their apex; each of the pairs in the
dry theca forms so projecting an angle at its base, that the orifice is almost
closed, a character exceedingly striking even to the naked eye. Calyptra
very hairy.