Cystodium
Content
Distribution
Louisiades present, Malaysia present, NE. Borneo present, New Britain present
Monotypic, Malaysia: from NE. Borneo to New Britain&Louisiades.
Notes
The single species agrees with Dicksonia in hairs and their distribution, in arrangement of vascular tissue in the frond, and in form of sori; it differs from Dicksonia (1) in normally prostrate position of stem, (2) in grooved upper surface of rachis, pinna-rachis and costules, (3) in shape of pinnules, which are crenate or serrate (not deeply lobed as in Dicksonia), (4) in circular transverse section of receptacle of sorus, (5) in smaller sporangia on longer stalks, and (6) almost vertical annulus, not indurated at the base.
John Smith (l.c. 1875) stated that the pinnules are jointed to the rachis (a character to which he attached great importance), but they are not so.
John Smith (l.c. 1875) stated that the pinnules are jointed to the rachis (a character to which he attached great importance), but they are not so.