Valentine, Esq., for a correct view of the structure of tit
stoma in this genus. It is formed by an intermediate membrane,
first detected by him, common to all mosses, but
in this genus considerably developed, to which he has
applied the term thecal membrane, whose expanded summit
in this instance constitutes the periphragm or border
of the mouth of the capsule.
Future observation may perhaps show this moss to be
only a singular variety of Hymenost. (Gymnostomum) mi-
crostomum, t. 2215.—W . W.
