6 THE JOURNAL OF BOTANY 



three inches long. Mons. Cardot points out that the nerve is 

 nearly always double, while very short, while in H. Webbiana it 

 is described as " nervo vix conspicuo unico " ; there appears, 

 however, to be some variation in the character of the nerve, 

 which is often almost obsolete, as well as in the habit and size ; 

 and specimens in the British Museum collection agree well with 

 our plant. 



Thamnium alopecurum B. & S. Evergreen woods, Teno Moun- 

 tains (no. 55) ; Agua Garcia (no. 60). 



Homalothecium barbelloides Card, k Dixon, sp. nov. (Tab. 

 509, fig. 2.) Caules elongati, 6-10 cm. longi, infra arete intertexti, 

 minime radiculosi, plus minusve distanter irregulariter ramosi, 

 niticli, sericei, laete virides, inferne straminei, gracilUmi, mollissinii, 

 flexuosi, filiformes, subcompressi ; habitu omnino Barbellarum 

 gracillimarum, praecipue B. pendulce (Sull.) Fleisch. 



Caulis tenerrimus, in sectione transversa subrotundus, fasci- 

 culo centrali vix ullo, reti laxiusculo pertenui, cellulis externis in 

 2-3 seriebus minoribus, valde incrassatis, extremis substereideis. 

 Folia sat conferta, sericea, madore erecto-patentia, ssepius subcom- 

 planatula, ramea raro paullo secunda, sicca parum mutata, i^arva, 

 e basi valde concava lanceolata, stricta, sensim in acumen acutis- 

 simum tenuem angustata, pluries plicata, 1-5-1-75 mm. longa, 

 marginibus planis, integris vel apicem versus subdenticulatis, 

 tenuicostata, costa longe sub apice evanida, circa | longitudinem 

 folii attingente. Cellulse laminae angustissime lineares (circa 2- 

 2-5 /x latas), basin versus parum mutate, ad angulos tantum 

 nonnullae breviores, latiores, subincrassatae, irregulares, subisodia- 

 metricae, pellucidai, alas yarvas, male definitas nee autem obscuras 

 effingentes. Folia ramea minora, angustiora, superiora saepius in 

 subuiam tenuissimam flexuosam angustatae, tenuissime costatae, 

 vix plicatae. Cetera ignota. 



Hab. Evergreen woods, Teno Mountains, Dec. 1909 (no. 52). 



A very pretty and delicate plant, the position of which in the 

 absence of fruit must remain somewhat doubtful; th« structure of 

 the leaves, however, agrees very closely with that of Homalo- 

 thecium, and it will probably prove eventually to be rightly placed 

 here. In habit it is totally distinct from any of the species of 

 Homalotliecium, or indeed of the allied genera, and is an almost 

 exact counterpart of Barbella pendula (Sull.) Fleisch. It is an 

 exceedingly interesting addition to the flora of these islands. 



The acumen of the leaf varies considerably at different parts 

 of the stem, sometimes being straight and comparatively short, 

 though nearly always exceedingly attenuated ; at others, being 

 longly subulate and often fiexuose or undulate. The branches are 

 often so attenuate as to be almost flagelliform. The leaves are 

 somewhat amplexicaul at base, deeply concave with the margins 

 broadly platter-edged, so that when in the natural position they 

 appear lanceolate from a very narrow basal line ; on pressure, 

 however, they can be flattened out, and then show a broad line of 

 insertion and an almost triangular outline, as in other species of 

 Homalothecium. 



