| WebNameShort | |
| Gyrosigma prolongatum (W. Smith) Griffith & Henfrey 1856 |
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| Gyrosigma quadratum (W. Smith) Griffith & Henfrey 1856 |
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| Gyrosigma rigidum (W. Smith) Griffith & Henfrey 1856 |
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| Gyrosigma speciosum (W. Smith) Griffith & Henfrey 1856 |
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| Gyrosigma spenceri (spencerii) (W. Smith) Griffith & Henfrey 1856 |
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| Gyrosigma strigilis (strigile) (W. Smith) Griffith & Henfrey 1856 |
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| Gyrosigma strigosum (W. Smith) Griffith & Henfrey 1856 |
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| Gyrosigma tenuissimum (W. Smith) Griffith & Henfrey 1856 |
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| Gyrosigma transversale (W. Smith) Griffith & Henfrey 1856 |
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| Himantidium pectinale var. beta Griffith & Henfrey 1856 |
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