125 
the Genus Strep top ogon. 
times project on the ventral (upper) surface in a mammillate 
manner ; in two instances a bistratose row of cells was observed 
near the nerve (Fig. 25). 
The calyptra is conical in general shape, and is usually 
truly mitraeform (Fig. 13). Sometimes, however, it is deeply 
split on one side, and so becomes subcucullate (Fig. 14). The 
latter shape was perhaps observed by Muller, and caused the 
remark in the ‘ Synopsis ’ ( 18 , p. 630), where, after giving 
Wilson’s character ‘ calyptra mitraeformis ’ for the genus, 
Muller says, ‘ Calyptra revera campanulata latere nunquam 
fissa ? ’ The ‘ setulae ’ on the upper part of the calyptra are 
formed usually of one cell ; rarely, however, two cells are 
found (Figs. 1 5, 16). It may be pointed out that in the 
present species the setulae are not found at the base of the 
calyptra, whilst in the closely allied S. clavipes, Spruce, they 
are specially numerous and well developed at the base of the 
calyptra. 
As has been remarked above (p. 112) the walls of the lower 
cells of the leaf become strongly porous in age (Fig. 7). 
S, rigidus, Mitt. (Figs. 38-40, 74-96). 
Calymperes Lindigii, Hampe, in Ann. Sci. Nat., 5 e s6r., iii, 342 
(1865) ; Mitten, Muse, austr.-amer. 127(1869); Jaeger, Adumbr. i, 
327 (1873) ; Paris, Index bryolog. in Actes Soc. Linn. Bordeaux, li, 
276 (1897). 
Streptopogon rigidus , Mitt., in Spruce, Cat. Muse. Amazon, et And., 
3, nr. 139 (1867) (nomen) ; Spruce, Muse. Amazon, et And., nr. 139. 
S. Calymperes, C. Miill., in Abhandl. d. naturwiss. Ver,, Bremen, vii, 
207, Taf. xiii, A (1882) ; Paris, Index bryolog. in Actes Soc. Linn. 
Bordeaux, li, 275 (1897) ( sphalm . calymperifolius) ; Miill., Gen. Muse. 
Frond., 422 (sect. Calymperella) (‘ 1901/ i. e. 1900) ; Broth, in Engler 
and Prantfs Natiirl. Pflanzenfam., 214. Lief., p. 419 (sect. Calymperella) 
(1902) (nomen). 
S. calymperoides, C. Miill. in Abhandl. d. naturwiss. Ver., Bremen, vii, 
207 (1882) (nomen) ; C. Mull., Gen. Muse. Frond., 421, 422 (sect. 
Calymperella) (‘ 1901/ i.e. 1900) (nomen); Broth, in Engler and 
Prantfs Natiirl. Pflanzenfam., 214. Lief., p. 419 (sect. Calymperella) 
(1902) (nomen). 
S. [Calymperella) Schenckii, C. Miill. ex Broth, in Hedwigia, xxxiii, 
