Bryum emergens C. Müll., Linnaea 42: 306.1879; Mielichhoferia emergens (C. Müll.) Broth., Nat. Pfl. 1(3): 598. 1904. Type: ARGENTINA. "Argentinia Tucamanensis, in montibus alpinis prope Tafi, Martio," P. G. Lorentz s.n. (lectotype NY!).
The type in NY consists of only a few plants,
but they appear to belong to Pohlia subg. Pohlia.
The plants are rather dull, very slender, with
terminal, paroicous inflorescences and a double
peristome. The exostome teeth are pale yellow,
slightly bordered, rounded at the apices and reach
250 µm in length. They bear a reticulate omamentation
dorsally near the base, and are coarsely
papillose in the upper third, a pattem typical
of Pohlia but not Schizymenium or Mielichhoferia
(Shaw, 1985b & unpubl.). The pale yellow
endostome has a cellular formula of 2:4 and consists
of a smooth basal membrane to 85 µm high
and narrow, slightly keeled but unsplit segments
150-250 µm long (from the capsule mouth). The
segments are papillose from their bases upward.
Cilia are absent. That the segments occasionally
have stout lateral projections might have led
Brotherus (1904) to place this species in Mielichhoferia.
However, the shape and diflferentiation
of the perichaetial bracts, combined with
other features, suggest that P. emergens should
be excluded from the Mielichhoferioideae.