DICRANUM DEBILE, Hook. et Wils.
Tab. 20.
Plantæ humiles, graciliores, gregariæ vel cæspitulosæ, flaves-centi-virides.
Caulis subsemiuncialis, simplex vel sæpius e basi pluries divisus, erectus vel ascendenti-erectus.
Folia minima, dissita, lineari-oblonga, ascendendo majora longiora confertiora, suprema longissima, subsecunda, carinato-concava, marginibus recurvis subundulatis; reti laxiore oblongo; costa valida semitereti cum vel sub apice obtusiuscula desinente.
Flores dioici: masculi subcapituliformes, in plantis femineis minoribus terminales.
Capsula ovalis, erecta, operculo subulirostro ipsam aequante instructa, annulata; pedicello mediocri; peristomii dentibus inferne purpureis striolatis, in crura duo longa scabra fissis.
Dicranum debile, Hook. & Wils. in Drumm. Musc. Amer. Coll. 2, No. 51 & 52 ; Sulliv. & Lesqx. Musc. Bor.-Amer. Exsicc. (ed. 1), No. 46b; Sulliv. Mosses U. States, p. 13.
Trichostomum tenue, Sulliv. Musc. Alleghan. No. 177.
Weissia exigua, Schwægr. Suppl. t. 179? ex Wils. in Lond. Jour. Bot. 1844.
Hab. Banks of ditches and roadsides, Louisiana and Alabama.
TAB. 20.—Dicranum debile.
1. Plantæ naturaii magnitudine.
2. Planta fertilis.
3. Planta mascula.
4. 5, 6, 7, 8. Folia.
9. Areolatio folii baseos.
10. Eadem folii apicis.
11. Sectiones trans. folii.
12, 13. Capsulæ.
14. Pars peristomii.
15. Sectio verticalis ejusdem.
16. Operculum.
17. Folium perigoniale.
18. Antheridium et paraphysis.
