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Taxon
Synthecium dentigerum Jarvis, 1922
Nomenclature
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Family: SyntheciidaeGenus: Synthecium
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Synonyms: 1
SUMMARY
Stems monosiphonic, basal internodes long, 3.0-3.6 mm, with 5 pairs of opposite hydrothecae; each succeeding internode with 2-3 pairs of hydrothecae in mid region, followed by a pair of opposite hydrocladia.
Hydrocladia arising perpendicular to stem from a distinct proximal joint; anastomoses, and some secondary branching occur.
Hydrothecae almost tubular, adnate for two thirds their length, fixed adcauline wall 0.45-0.51 mm long, free wall 0.15-1.2 mm; abcauline wall 0.36-0.42 mm. Margin narrow, sinuated, with slightly everted rim, 0.21-0.27 mm in diameter. Proximal hydrocladial hydrothecae subalternate, becoming opposite distally . Adcauline submarginal tooth present in most hydrothecae, variable from wedge-shaped to a mere thickening of the adcauline wall. No abcauline teeth or marginal reduplications.