ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 81 



tlie capsule, and applied to it either along their whole surface or at the 

 apex only. According to these characters, he divides the species into 

 six natural groups, as follows : — 



I. Orihotriclm cupulata. — Cryptoporous ; peristome-teeth dry, erect 

 or spreading radially, with indistinct curved lines and no or very 

 few papillae : — 0. cupulatum, anomalum, urnigerum, Schuhartianum, and 

 Venturii. 



II. Oriliotricha rupestria. — Phaneropiorous ; peristome-teeth erect, 

 with a larger or smaller number of scattered thick papillpe, without 

 the characteristic curved lines of the previous group : — 0. rupestre, 

 Icevigatum, Sturmii, Blyttii, cetnense, flaccum, Shawii, Franzonianum, 

 ovatum, and Holmgreni. 



III. Oriliotricha straminea (?). — Cryptoporous ; peristome-teeth 

 recurved and finely punctated. This includes three subdivisions. 



1. Neck of the capsule suddenly constricted to the seta : — O.fallax, 

 Philiberti, and many exotic species. 



2. Peristome with eight teeth so strongly recurved that they are 

 applied to the outer wall of the capsule through their whole length : — 

 0. rivulare, Sprueei, stramineum, alpestre, pallens, patens, Sogeri, Braunii, 

 tenellum, microcarpum, pumilum, and polare. 



3. Peristome-teeth split in the middle when dry, and after the 

 operculum is thrown off, and recurved so that their apices touch the 

 wall of the capsule : — 0. pulchellum and Winteri. 



4. Seta elongated, so that the capsule is elevated above the peri- 

 chsetial leaves, as in Ulota : — 0. leucomitrium and many exotic species. 



0. diaphanum and several scarcely distinguishable exotic species 

 appear to occupy a special position in this group, having coloured or 

 setose apices to the leaves and peristome-teeth, of which there are six- 

 teen outer and sixteen inner, streaked by fine vertical lines. 



IV. (unnamed).— Phaneroporous ; peristome-teeth more or less 

 densely covered with papillte, recurved when dry : — 0. Shawii, leiocar- 

 pum, Lyellii, speciosum, affine, fastigiatum, apiculatum, neglectum, elegans, 

 and medium. This group is also divided into three subdivisions. 



1. Outer peristome composed, when ripe, of sixteen teeth, which 

 are recurved after the operculum is thrown off, so that their apices 

 only touch the wall of the capsule, but are so densely covered with 

 papilla that the septa are scarcely perceptible : — 0. Shawii, leiocarpunif 

 Lyellii. 



2. Capsule narrow, slightly striated, raised above the perichaetium 

 on a long seta ; white peristome-teeth recurved, so as to form almost 

 a projecting ring round the mouth of the capsule: — 0. speciosum; 

 0. elegans presents a transition to the next section. 



3. Peristome-teeth not split, and therefore always a multiple of 

 eight ; papillae more numerous than in group II. 2, smaller than in 

 group I. ; hence, in consequence of the opacity of the teeth, curved 

 lines are to be seen in all directions among the papillae of an entirely 

 different character from those in group I. ; curved lines of the same 

 kind are also sometimes visible on the cilia of the inner peristome ; the 

 cilia are also sometimes provided with appendages similar to those of 

 0. speciosum : — 0. affine, fastigiatum, neglectum, apiculatum, and medium. 



Ser. 2.— Vol. I. G 



