RL SON ER TR PVC NS CAT j'en 
REVUE BRYOLOGIQUE 43 
and more closely resembling certain East Indian species. The den- 
ticulation of the leaf apex though somewhat variable is always 
observable and often very distinct, and the basal areolation is 
also very marked. In this and in the character of the upper cells 
it comes very close to some Indian species of Hyophila and the 
allied genus Merceyopsis Broth. et Dixon, and the hyaline axillary 
threads,on which Mr. Nicholson has almost certainly detected 
pluricellular gemmæ, afford another indication that the plant pro- 
perly belongs to Hyophila. The only other species to which it 
manifests a possible affinity are certain denticulate species of 
. Didymodon; but the areolation there, especially the basal, is 
very different. Didymodon riparius Kindb. (Trichostomum Warns- 
torfii Limpr.) is quite different in leaf form and basal areolation, 
. and a more robust plant altogether. Zygodon gracilis is also more 
robust, with larger leaves much wider below, and with a totally 
different basal areolation. 
Weisia calcarea G. M. Frequent on limestone walls, mortar, etc. 
in the neighbourhood of Caldas; cfr. 
Weisia viridula var. stenocarpa (Bry. germ.) B. et S. Dr. Roth 
refers to this var. a plant which we gathered in numerous loca- 
lities in Algarve and which showed some considerable variation 
in peristome teeth, but was specially marked by the foliage 
which was usually wide, with widely incurved margins and 
rather stout nerve, in fact at times indistinguishable from W. lor- 
tilis except by the peristome. This however is too strongly deve- 
loped for W. crispata C. M. The narrow capsule which is the prin- 
cipal character of the var. slenocarpa did not strike us as specially 
characteristie of our plant, compared with the foliage characters. 
On the whole the variability in leaf, peristome and spores Im 
W. viridula seem so numerous and so little correlated with one 
another, that it is almost hopeless to group them under well 
characterized varieties. 
We gathered this plant in various spots both at Caldas and 
_ Portimâo. ue 
Weisia lortilis we did not find in fruit, and plants which in 
_ vegetative characters seemed to denote its presence very proba- 
bly belonged to the last species or possibly the following. 
W. crispata C. M. Picota ; cfr. By stream near Caldas; cfr. | 
Trichostomum inflezum Bruch. On stones, Portimâo; cfr. Foot | 
of wall, on rock, Silves; cfr. : 
Tr. flavo-virens Bruch. Sand dunes, Colhares, in abundant, but 
old fruit. 
Tr. nilidum var. oblusum, forma ; on shaded rocks, Caldas; st. 
