Leptodontium. | l. BICRANEX. 51 
Caulis 1-2 uncias altus. Folia sicca curvata subappressa, juniora luteo- 
viridia, seniora fusca. Pedunculus 3-linearis, luteus. Theca fusca. 
Leaves longer and narrower than in L. sulphureum, not much 
altered when dry, the pericheetial leaves remaining straight. Very 
near to this or to L. wlocalyx is the Syrropodon ? excelsus, Sull., of 
the United States. 
4. L. suLPHUREUM (C. Müll. Syn. ii. 626, Trichostomum). ` Caulis 
elongatus, fusco-tomentosus. Folia basi erecta, nervo percurrente carinata, 
marginibus a basi ad medium usque reflexis, inde ad apicem serrulatis, 
cellulis basi paucissimis elongatis, ad latera minutis rotundis, gs 
rotundis parvis obscuriusculis, fere omnibus minute papilliferis; ** peri- 
chetialia L. ulocalycis, sed basi e cellulis laxis elongatis haud interruptis 
reticulata. Theca in pedunculo brevi flexuoso flavo, erecta, solitaria, cylin- 
dracea, arcuata, apicem versus angustata, microstoma, ore purpurea, oper- 
culo oblique subulato longiusculo, peristomii dentibus brevissimis angus- 
tissimis remote articulatis." 
Hab. Nicaragua in monte vulcanico Viego (5000 ped.), Girsted. 
Caulis 3-uncialis, ramosus. Folia flava, sicca appressa, contorta. 
5. L. vuLocarvx (C. Müll. Syn. ii. 578, Trichostomum). Tomentosum ; 
habitus L. squarrosi. Folia caulina longiora angustiora, basi e cellulis an- 
gustis firmis rectangularibus inferne levibus superne punetulatis supra 
basin angulato-rotundatis minutissime papillosis areolata, supra basin bre- 
vissimam margine ultra medium revoluta, apicem versus ineequaliter ser- 
rata, excurrentinervia; perichetialia e basi longe vaginante, cujus cellule 
anguste elongate ubique parietibus interruptis instructze firmee haud laxe 
tenere, longe anguste acuminata, valde undulata. Theca in pedunculo 
brevi, tortili, rigido, erecta, eylindrico-oblonga; peristomii dentes (thecæ 
deoperculatz supramaturz) rudimentarii brevissimi.— C. Müll. l c. 
Hab. Mexico, Deppe et Schiede (sub nom. Trichostomi squarrosi, 
Hornsch.). 
Species ex auctore L. squarroso, Hook. (Didymodonti) Muse. Exot. 
t. 150, Indiz orientalis similis. 
6. L. AcuTIFOLIUM (Mitt.). Caulis elongatus, ramosus. Folia a basi 
erecta superne dilatata sensim angustata, complicata, nervo subpellucido 
pereursa, marginibus a basi ad medium usque recurvis reflexisve, integer- 
rimis, inde ad apicem serrulatis, cellulis basi elongatis angustis pellucidis 
spatium pallidius suborbiculari-obeordatum occupantibus, infimis croccis, 
marginalibus superioribusque omnibus minutis rotundis, papillis ob- 
seuris; pericheetialia caulinis subtriplo longiora, interna erecta, convoluta. 
Theca in pedunculo elongato, stramineo, ovali-cylindracea, operculo brevi 
subulato, peristomii dentibus angustis brevibus. 
Hab. Guatemala, Volcan de Fuego, Godman et Salvin. Andes Quitenses, 
Chiniborazo et Cayambe, Jameson ; Pangor et Carguairazo (procerius) ad 
rupes (10,000-11,000 ped.), Spruce, n. 29. 
E 2 
