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Alsophila glabra
Gymnosphaera glabra, synonyms Alsophila glabra and Cyathea glabra, is a species of tree fern native to Borneo, western Java, Sumatra, the Lesser Sunda Islands, Sulawesi, and the Malay Peninsula, where it grows in lowland swamp forest and montane forest at an elevation of up to 1500 m. The trunk of this plant is erect and 2–4 m tall. Fronds are bi- or tripinnate and 1–2 m in length. Characteristically of this species, the lowest pinnae may be significantly reduced. The stipe is very dark and bears basal scales. These scales are dark, glossy and have a paler margin and fragile edges. Sori are produced in groups of one to three on fertile pinnule veins. They lack indusia.
Large and Braggins (2004) noted that G. glabra is very similar to Gymnosphaera gigantea and appears to form part of a complex that also includes G. podophylla and G. subdubia.
Gymnosphaera annae · Gymnosphaera biformis · Gymnosphaera commutata · Gymnosphaera dimorpha · Gymnosphaera metteniana · Gymnosphaera acrostichoides · Gymnosphaera andersonii · Gymnosphaera atropurpurea · Gymnosphaera baileyana · Gymnosphaera capensis · Gymnosphaera denticulata · Gymnosphaera gigantea
Text excerpted from the Wikipedia article Gymnosphaera glabra by its contributors, under CC BY-SA 4.0; the excerpts are shared under the same licence.
