<- ë 4 S ve Mt PES Le an Eu) Lx Je 
RME S ARRET ER S Se In TS \ 
48 : REVUE BRYOLOGIQUE 
repens , interdum stoloniformis , radiculos hic illie emittens, 
vage ramosus, rami breves, vix 1cm. longi, parum attenuati, hic 
illic ramulosi, siccitate plerumque curvati. Folia caulina laxa, 
madida patula, e basi deltoideo-ovata angusle acuminala, mar- 
ginibus planis seu uno alterove leniter recurvo, integris. Folia 
ramea subconferte imbricata, subpatentia, siccitate erecta sub- 
julacea, concava, variabilia, oblongo-ovata acuta, vel oblonga 
obtusiuscula, rarius obtusa, infra uno sallem margine anguste 
forliler recurvo, supra marginibus planis, plus minusve argute 
serratis. Costa validiuscula, medium folium paullo superans. 
Areolatio pro more perbrevis, in foliis caulinis e cellulis supra 
vermiculato-ellipticis (6-10 x 1) instructa, marginem versus bre- 
vioribus, alaribus permullis subrotundis vel subhexagonis vel 
breviter rectangularibus, saturate chlorophyllosis, zonam lalam 
allam obliquam formantibus ad quartam vel terliam parltem long- 
iludinis folit allingentem. Cellulæ foliorum rameorum breviores 
(4-8 X 1), apicem versus perbreves (1.5— 3 X 1), apicales in folüs 
obtusioribus sæpe rotundæ vel subrotundæ, eæ partis folii dimi- 
diæ superioris dorso spiculis e parte apicali parielis prominentis 
formalis ascendentibus densiuscule argule scabridæ. 
Cetera  ignota. 
Hab. Among hepaticæ, Radula Lindbergii Gottsch and Lejeu- 
nea cavifolia (Ehrh.), on rock, damp slopes of Picota, between 
Monchique and Caldas, Algarve, 10 May, 1911. 
Various forms of Isothecium at times show the apical part of 
the cell walls prominent and scabrid at the back of the leaves, 
such as Z: myurum var. scabridum Limpr., and several forms of 
1. myosuroides and the allied North American 1. sloloniferum. 
These are rightly considered to be but forms or states of their 
respective types, and on the basis of this leaf papillosity alone we 
should not have ventured to describe this plant as new, although 
the papillæ are denser and stronger than in any other plant I have 
seen of the European or N. American forms. The other characters, 
however, and especially the basal areolation,seem to justify its 
being given specific rank. In Z. myurum the alar cells form a small 
and more or less distinctlÿ rounded group at the slightly dilated 
angles of the leaf, so as to form more or less well defined, some- 
. what inflated auricles,while the juxta-marginal cells above these 
are different in form, but shorter than the median cells and 
remaining so for à few rows extending obliquely üpwards. In the 
present plant the alar cells do not:form élearly delimited or 
expanded auricles, but occupy the whole angle of the leaf, often 
extending nearly to the nerve,and are gradually modified upwards_ 
