They fall into three groups from different regions of the world and out of the
eighteen
species six of them do not produce pups and therefore are considered
solitary species and can only reproduce from spore *
willinckii
veitchii Java – Australian Regions
bifurcatum
hillii
superbum *
holttumii *
grande * Malayan – Asiatic Regions
wandae *
wallichii *
coronarium
ridleyi *
alcicorne
ellisii
stemaria
elephantotis Afro – American Regions
andinum
quadridichotomum
madagascariense