the Genus Streptopogon . 1 1 3 
allowing me to examine the whole of the material belonging 
to Streptopogon contained in his herbarium ; and to Mr. A. 
Gepp, F.L.S., for assistance rendered when examining the 
specimens in the Herbarium of the British Museum (Natural 
History). 
Streptopogon, Wils. ex Mitt, in Hooker's Journ. of Bot. iii, 
(1851). 
Musci caespitosi vel pulvinatim caespitosi, saepe habitu ortho- 
trichaceo, e olivaceo-viridi vel olivaceo-lutescente rufescentes. Caulis 
erectus vel adscendens, dense vel laxius foliosus, interne radiculosus, 
dichotome vel fastigiatim ramosus, raro simplex. Folia humida 
mollia erecto-patentia vel patenti-patula sicca adpressa apice incurva 
vel spiraliter torquescentia, concava vel carinato-concava, ovato- 
oblonga vel oblongo-spathulata vel elongato-lanceolata, apice acumi- 
nata vel raro obtusiuscula cucullatave, elimbata vel limbata, limbo 
flavido e cellulis unistratosis elongatis parietibus incrassatis composito, 
nervo plus minus valido aut in arista longa excedente aut in folii 
summo apice dilatato ibique globulum gemmarum gerente, rarissime 
in folii apice cucullato desinente, margine integro vel superne denticu- 
late vel spinoso-denticulato inferne recurvo vel revoluto, cellulis 
superioribus plus minusve laxis hexagonis et hexagono-rectangularibus 
interdum marginem versus minoribus et subquadratis, utriculo pri- 
mordiali contracto repletis, inferioribus longioribus subrectangularibus, 
omnibus (cellulis gemmiferis exceptis) laevissimis pellucidis. Folia 
perichaetialia caulinis conformibus. Capsula immersa vel emergens vel 
exserta in pedunculo erecto brevi, erecta, maiuscula, oblonga vel oblongo- 
cylindrica, vel subcylindrica, laevis, exannulata, vel raro annulata, basi 
stomatibus superficialibus instructa. Peristomium rubrum, basi tubo 
brevi vel longo saepe pallido interdum rectangulari-tessellato instructus, 
exinde in crura filiformia circa axem idealem sinistrorsum plus 
minusve contorta divisum, cruribus aut 32 aequidistantibus aut 16 
in parte inferiore tertia in fila duo seiunctis. Columella exserta, parte 
excedente fugace. Operculum conico-subulatum, cellulis spiraliter 
contortis vel rectis. Calyptra mitraeformis raro ^syibcucullato-mitrae- 
formis setulosa vel scabra vel raro perfecte glabra. Sporae parvulae 
laeves. Autoici vel dioici. Habitatio ad arborum fruticumque 
corticem. 
I 
