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Taxon
Monotheca flexuosa (Bale, 1894) [Invalid]
Nomenclature
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Genus: PlumulariaSpecies: Plumularia flexuosa
SUMMARY
Stems to 5 mm high, flexuous, monosiphonic, unbranched, arising from a creeping tubular hydrorhiza; perisarc of proximal stem fairly thick, nodes distinct, without nematothecae; internodes of hydrocladiate stem region slender, expanding a little distally, nodes transverse, deeply incised, a nematotheca halfway along internode, one or two in axil of apophysis and one just below axil.
Hydrocladia alternate, fairly short, proximal internode athecate, node narrow, slightly oblique, followed by hydrothecate internode; hydrotheca sunk into and projecting beyond end of hydrocladium, deeply campanulate, expanding to margin, abcauline wall weakly concave, adcauline wall almost straight, base rounded, margin circular, flaring but not everted.
Nematothecae all two-chambered, basal chamber of mesial inferior short, cup reaching base of hydrotheca, adcauline side foreshortened; twin laterals inserted in blunt apex of hydrocladium below hydrotheca, basal chamber long, cup circular, fairly wide and shallow; cauline and axillary nematothecae same as mesial.