Bornetella sphaerica

Thallus spherical, oval or pear-like, slightly calcified, solitary or in groups, commonly bright grass-green, brownish green to dark green, 0.5–1(-1.5 cm high, ~1 cm in diam.). Surface cells mainly hexagonal, 240–300×220–300 mm. Inner structure composed of central axis bearing radially arranged 14-24 primary branches with distal whorls of 3-8 pedicellate secondary branchlets joined together to form monostromatic cortex. Aplanosporangia spherical, 180–300 mm diam., develop laterally on primary branches, each bearing 4-14 spherical aplanospores, 75–120 mm diam. Stipe thin, 1–5 mm long ending into small branched rhizoids. Growing on dead massive corals, often on sand-covered rocks in shallow sheltered shores.

Africa, Indian Ocean Islands. Common in countries of the Asia-Pacific Region: China, Japan, Taiwan, Vietnam, Singapore, Philippines, Indonesia, Australia, New Zealand, Pacific Islands.