Children (12 direct children, 14 direct and indirect children):
Physoceras australe
Physoceras bellum
Physoceras betsomangense
Physoceras bifurcum
Physoceras boryanum
(tree size 2)
Physoceras epiphyticum
Physoceras lageniferum
Physoceras mesophyllum
Physoceras perrieri
Physoceras rotundifolium
Physoceras violaceum
Physoceras castillonii