HYPNOIDEAE. HYPNUM. 287 
acumine brevi vel dimidio folio aequali, integerrima, 
parum concava, valde pellucida, vix nitida, amoene vi- 
ridia, enervia, cellulis reticuli parallelogrammis, in arcus 
iransversos digestis; perich. oblongo - acuminata, apice 
denticulata; theca in ped. erecto unciali, apice incurvo, 
tenuissimo tortili luteo - brunneo pendula, urceolata ae- 
qualis, siccitate infra os valde contracta, luteo - brunnea, 
operc. longirostri. T. 
Isothecium leptochaeton Brid. II. p. 387. 
Patria. Ad truncos arborum insulae Martinique et 
Cayennae: Richard. 
130. H. Olfersii Hsch. (Fl. Bras. I. p. 83.); monoi- 
cum; caulis repens laxe irregulariter pinnatus, ramis bre- 
vibus subsimplicibus patentibus prostratis albescenti- vi- 
ridibus; folia caulina subdisticha laxe imbricata secunda 
subhomomalla, oblongo-lanceolata longissime acuminata, 
integerrima, enervia (?), lineari-areolata; perich. intima 
angustissima et longissime acuminata, omnia integerrima 
enervia concava dilute pallide viridia lineari — areolata; 
theca in ped. gracili tortili laevi purpurascente apice cur- 
vato horizontalis, minute oblonga aequalis, operculo he- 
misphaerico longe rostrato thecam aequante; perist. d. 
ext. intus cristati, ferruginei, interni lutei solidi, ciliis 
brevioribus subulatis hyalinis interpositis. T. 
Patria. Brasilia, Tijuca in vicinia Sebastianopoleos: 
Olfers. 
Ob cellulas alares nobis ignotas (forte vesiculaefor- 
mes flavidas) sedis incertae. 
131. M. retroflexum Hook. (in Wallich. Cat. n.7636.) ; 
monoicum? longe repens tenellum, ramis brevibus erectis 
regularibus simplicibus eleganter pinnatum, folia caulina 
latiuscule ovata, acumine breviusculo plus minus recurvo 
latiusculo terminata, siccitate recurva squarrosa, margine 
erecto ubique serrulato, nervis brevissimis vix conspi- 
cuis. 1. 
Hook. Ic, Pl. Rar. I. t. 23, f, 6, — Harvey in Lond, Journ, of 
bot, 1840, 2. p. 19. 
