Shi Yong Dong

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Gymnosphaera schliebenii, synonyms Alsophila schliebenii and Cyathea fadenii, is a species of tree fern endemic to the Uluguru Mountains in Tanzania, where it grows on exposed ridges and on the upper edge of montane forest at an elevation of 1700–2100 m. The trunk is erect, up to 4 m tall and 3–5 cm in diameter. Fronds are bipinnate. Characteristically of this species, the most basal pair of pinnae are reduced, often to veins alone.

Gymnosphaera olivacea is a species of tree fern endemic to eastern New Guinea.

Gymnosphaera capensis, synonyms Alsophila capensis and Cyathea capensis, (known as the "forest tree fern") is a regionally widespread and highly variable species of tree fern. It is indigenous to Southern Africa (subsp. capensis) and South America (subsp. polypodioides).

Gymnosphaera baileyana, synonyms Alsophila baileyana and Cyathea baileyana, also known as the wig tree fern, is a species of tree fern native to northeastern Queensland in Australia, where it grows in wet gullies and forest at an elevation of 850–1200 m. It is a rare species that is seldom found in the wild. The erect trunk is 4–5 m tall, approximately 10 cm in diameter and may be covered in stipe bases in the upper regions. C. baileyana is notable for being able to develop offshoots from the base of the trunk. Fronds are bi- or tripinnate and may be exceptionally long, up to 7 m, though they

Gymnosphaera acrostichoides is a species of tree fern found in forests of eastern Indonesia and Papua New Guinea.

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