. 400 REVUE BRYOLOGIQUE. 
stem-leaf, from which alone I have always taken my measu- 
rement of normal cells. Then he says nothing about the 
bracts being subcorda te at the base — a notable character in 
my plant ; and there are other differences to be pointed out 
in the following diagnosis ; so that it is not impossible S,. 
Sprucei also may be a composite species, like Nees’s Gymnom. 
adustum ; so difficult is it to separate closely-allied species of 
these minute plants, when two or more kinds grow closely 
interwoven in one tuft. Limpricht quotes the specimens pu- 
blished in Carrington and Pearson's « Hepaticæ Britannicæ », 
no 5, under the name « /Vardia adusta », as examples of his 
Sarcoscyphus Sprucei. In my copy, no 5 is a stunted form of 
Marsupella adusta (N.) vera, having the perianth-leaves in 
various degrees of adhesion to one another and to the invo- 
 lucre, but never (apparently) combined into a complete tube; 
_ and the stem-leaves as in Limpricht’s specimens of Gymnom. 
 adustum. In M" Pearson’s copy, no 5 consisls of Marsupella 
 adusta (N.) mixed with Sarcosc. adustus Spruce, olim ; bui the 
datter by no means agrees with Limpricht’s description of 
_S. Sprucei. 
__ AsT have already shown that Marsupella and Gymnomitrium 
_ äre but sections of one and the same natural genus, in which 
_ there cannot therefore coexist two species with the name 
© adusta », if we adopt Limpricht's determination of the true 
adusta, T must call ‘he quondam Sarc. adustus by another 
name, viz. Marsupella ustulata ; and 1 proceed to offer a full 
description of it. 
MARSUPELLA USTULATA I. Sp. 
_Cæspites lati humillimi, raro virescentes, plerumque brun- 
neo-purpurei — quasi adusti —intus pallidi tenerique; in 
 alpinis plus minus nigricantes. Rhizoma repens radicellosum, 
 flexuosum ei intricatum, interdum flagella demittens ; caules 
plures subrectos, 2-5» altos, 10-42 cellulas (—145%*) in 
diametro, subsimplices, rarius innovalos, omnes pro more 
_Clavatos apiceque floriferos, paucos steriles æqui-et parvi- 
 folios, proferens. Folia caulium sterilium, æque ac caulis 
 fertilis inferiora, parum imbricata, paientia vel erecto-pa- 
_ tenlia, late ovali-ovato-vel subrotundo — quadrata— interdum 
. Subobovata—laxe complicato-carinata ad = biloba, sinu 
ad angulum rectum aperto, acuto, rarius obluso, 
o suboblusis, utraque basi anguste rotundata ; 
nformes, ad angulos paulo incrassaiæ, sat pellu 
b et fere vacuæ., Flores terminales 
