Pronephrium granulosum

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Pronephrium granulosum


Asia-Tropical: Philippines (Philippines present), Balabac present, Luzon present, Mindanao present, Palawan present, Panay present
Malesia: Philippines (Luzon, Palawan, Balabac, Panay, Mindanao).


One frond in Haenke's collection at Prague has two pinnae widened and irregularly deeply lobed distally; Presl named this var. lobata. This feature may indicate hybridity; it needs experimental investigation.
Young plants have much smaller pinnae than above described; the smallest fertile pinna seen measures 4.5 x 1.2 cm. A specimen from Balabac (J. B. Steere) has no glands on sporangia, and pinnae crenate to a depth of 2 mm; otherwise it is very near the type. A specimen from Mindanao has very narrow pinnae, the largest fertile one 5.0x0.8 cm.


Copel. 1960: Fern Fl. Philip.: 374
Holttum 1969 – In: Novit. Bot. Inst. Bot. Univ. Carol. Prag.: 19
Christ 1907 – In: Philip. J. Sci.: Bot. 217