Stegnogramma

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Stegnogramma

Distribution

Asia-Tropical:, Borneo present; Jawa (Jawa present); New Guinea absent; Sulawesi (Sulawesi present); Sumatera (Sumatera present) Luzon: present Mindanao: present Pacific: absent Pantropic: present subtropic: present
Pantropic (excluding New Guinea and the Pacific) and subtropic, c. 18 spp.; in Malesia on mountains in Sumatra, Java, Borneo, Celebes, Luzon, Mindanao.

Taxonomy

Iwatsuki's arrangement of 1963 is here adopted. In it he recognized four sections, two of which (Haplogramma and Dictyocline) do not occur in Malesia. The New World species (see Iwatsuki 1964) are not yet well studied. In Malesia, the widely-distributed species S. pozoi is represented by a variety in Java; the other plants of sect. Leptogramma, from four widely-separated small areas, are here regarded as representing separate species, but more material is needed to characterize them clearly; only S. dissitifolia has been well collected.
Stegnogramma is related to those species of Sphaerostephanos which have no spherical glands, but is distinct in the combination of characters mentioned in the generic description. In the 19th Century, species of this genus were usually placed in Gymnogramme.
The peculiar Hawaiian species Pneumatopteris sandwicensis (Brack.) Holttum shares with Stegnogramma the characters of venation of the apical lamina and few thick hairs between veins on the upper surface of pinnae, and has somewhat elongate sori, but differs in sporangia and spores.

Cytology

Chromosome number 36 in sect. Leptogramma (diploid in Mexico, Ceylon and Japan; tetraploid in Madeira); in other sections unknown.

Citation

Ching - in Sinensia. 1936: 90
Copel., Gen. Fil. 1947: 144
Ching - in Sinensia. 1936: 96
Blume - in Acta Phytotax. Sinica. 1963: 329
K. Iwats. - in Acta Phytotax. Geobot. 1963: 112
Blume - in Amer. Fern J. 1964: 141
J. Sm., Hist. Fil. 1875: 231
Holttum - in Blumea. 1971: 38
Blume - in Mem. Coll. Sci. Univ. Kyoto B. 1964