DESCRIPTIONS OF NEW BRITISH MOSSES. 195 
the leaves are scarcely narrowed above the middle, and end in a blunt 
point, the upper portion of the leaf appearing, on transverse section, 
to be composed entirely of the dilated plano-convex nerve ; in S. calci- 
cola the nerve is narrower, and distinguishable from the pagina nearly 
to the apex; occasionally a leaf may be found in which the nerve ap- 
pears altogether wanting. In $. calcarea the capsule, after the fall of 
the operculum, becomes remarkably turbinate from the dilation of its 
mouth. The operculum, calyptra, and peristome are alike in both species 
From these S. pusilla, Ehrh., differs in the bright green colour of ite 
much narrower leaves. Until the publication of that portion of the 
* Bryologia Europea ' containing the Seligeria, S. calcicola was supposet 
to be the Grimmia Seligeri of Weber and Mohr, p. 140, and these au 
thors, who seem to have been very well acquainted with 5. calearea-and 
S. pusilla, finish their remarks upon G. Seligeri by saying at p. 459, “ In- 
termedia quasi species inter G. pusilla et calear.,” having in their descrip- 
tion pointed out that the leaves were different in G. Seligeri from both 
those species. In Nees, Hornschuch, and Sturm, * Bryologia Germanica,’ 
vol. ii. p. 105, Weissia Seligeri is characterized thus, “ subacaulis, sor- 
dide viridis, foliis strictis infimis ovatis enervibus reliquis lanceolatis 
apice subalatis, capsula obovata, opereulo e basi convexa subulato sub- 
obliquo," t. 34, f. 26, and excepting that the figure of the entire plant 
has the leaves represented too short, both it and the description cor- 
respond well with the Sussex species. In the ‘ Bryologia Europea’ the 
_ Weissia Seligeri, Bry. Germ. is referred to Seligeria pusilla with the 
| following remark :—** Nous avons pu nous convaincre sur des échan- 
tillons originaux que le Weissia Seligeri des auteurs ne diffère de la 
forme type du S. pusilla que par les feuilles un peu moins longues et 
d'un vert moins gai ;" and at the end of their history of the species of 
the genus Seligeria they also say, * Quand les auteurs du Bryologia 
Germanica séparent leur Weisia Seligeri du JF. pusilla, c'est que ces 
savants bryologistes n'ont pas tenu compte de la station et de Pigo 
des individus qu'ils avaient sous les yeux en formant cette espèce.” 
Unless, therefore, this conclusion has been too hastily arrived at, the 
eissia Seligeri of authors must be given up as only a form of 8. pu- 
de notwithstanding the close agreement of its characteristics with 
those assignable to S. calcicola. 
LANATION OF PLATE XIX. 
Fig. 1 8. caleicola- sene size). Fig. 2. Entire plant, with ——— at 
