Mr. R. Spruce on the Musci and Hepatice of the Pyrenees. 271 
libus implexis dense obtegens. In Alpibus Helveticis et Tyro- 
lensibus viget, sec. cel. Schimper. 
Caulis procumbens, subdivisus, divisiones irregulariter pinnate vel 
subbipinnate, ramique crocei, subcurvati, dense foliosi et inter folia 
radicibus pallidis, decompositis, planis, versus basin 2—4 cellulas latis, 
obsessi. Folia imbricata, patentia, ovata, apiculata et acuminulata, 
apice subtorta, concava, margine reflexa, argute et in parte superiori 
subduplicato-serrata ; plicis tribus strizformibus, media nervum de- 
bilem, seepe ramosum, rarissime duplicem, supra medium evanescen- 
tem involvente, instructa; e cellulis minoribus areolata, lutescentia : 
ramulina angustiora, plica media fere obliterata et ex eo nervo mani- 
festiori. Flores et fructus desiderantur. 
Ab hoc differt H. umbratum, Ehrh., divisionibus bipinnatis, ramulis 
gracillimis ; radiculis compressis, latioribus, e 5-6 cellularum seriebus 
conflatis ; foliis multo minoribus, magis patulis, caulem ramulosque 
haud velantibus, plerumque nervis binis instructis. 
Tas. I. 1. rami pars augm.; 2. folium caulis; 3. ramuli augm. ; 
4. apex folit augm. circiter 240ies ; 5. pars stuppe radiculose inter- 
foliaris pariter aucta. . 
Obs. Although this comes so near H. umbratum in essential cha- 
racter, it has yet a very different habit, arising from the less di- 
vided stems and the much larger leaves, which are imbricated at such 
an angle as not to allow the stem to appear between them. All the 
states of H. brevirostre differ from it in the leaves being contracted 
below the long acumen, and especially in their being prolonged at the 
base into two semicircular free auricles, which are inflexed and em- 
brace the stem *; they are also usually sqguarrose and furnished with 
two short nerves. H. plicatum, Schleich., is very similar in habit, 
and has the leaves plicato-striate in the same manner, but the latter 
are subsecund, with a longer nerve, their margins entire and most 
widely reflexed at about two-thirds of theirlength. H. Kamounense, 
Harv. (Hook. Icones, 1. t. 24. f. 10), an Indian species, seems also to 
approach it very closely, differing chiefly in the shorter, almost obso- 
lete nerve, the less sharply toothed margins of the leaves, and their 
more twisted apices, often describing two spires. 
§ 3. Squarrosa. 
7. H. brevirostre, Ehrh. Pl. Exsice. n. 85; Schwgr. Suppl. 
feo: M.P..5. 
Hab. 7,2 in umbrosis fere ubique, copiose fructiferum. 
8. H. triquetrum, L. Sp. Pl. p. 1593, E. Bot. t. 1622 ; M. P. 7. 
Hab. Zo—3 in sylvaticis. 
9. H. squarrosum, L. Sp. Pl. p. 1593; Dill. t. 39. £38. 
Hab. Zo_3 in sylvis, pascuis, etc., rarissime fructificans. 
* This has not altogether escaped the notice of Schwaegrichen, who says 
of H. brevirostre, “folia cordato-ovata ..... angulis baseos lateralibus 
inflexis.”’ 
