Dotyophycus abbottiae (Nemaliales), a new red algal species from Western Australia

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Abstract
Dotyophycus abbottiae is described from Rottnest Island, Western Australia. Features distinguishing the new species from the other two members of the genus include: (1) the abundance of subsidiary cortical filaments, derived from both rhizoids and primary cortical filaments, which appear to be lacking or scarce in D. pacificum Abbott and D. yamadae (Ohmi and Itono) Abbot and Yoshizaki; (2) the mixture of disparate cell sizes in the outer cortical layers, especially the surface layer, which is not seen in D. pacificum and D. yamadae; (3) the development of up to 13 subsidiary carpogonial filaments in an often scattered arrangement along the axis of the primary carpogonial filament, in contrast to the monocarpogonial condition of D. pacificum and the generally more compact arrangement of subsidiary carpogonial filaments produced by D. yamadae; (4) the rectilinear outlines of the distal cells of primary and subsidiary carpogonial filaments, as opposed to the generally rounded contours of such cells in D. pacificum and D. yamadae; (5) the initiation of gonimoblasts from an undivided carpogonium, in contrast to the issuing of gonimoblasts from both products of an initial transverse division of the zygote in D. pacificum and D. yamadae; and (6)the narrow, linear inner gonimoblasts, compared with the broad, more moniliform inner gonimoblasts of D. pacificum and D. yamadae. Features of Dotyophycus are compared with those of other genera of the Liagoraceae, with the closest relative considered to be the monotypic genus Liagoropsis.