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Total: 19

genus valid

Genus Amyelon Will. Proc. Roy. Soc. London, 20(136): 436. 25 Sep 1872

genus valid

Genus Arpexylon Will. Proc. Roy. Soc. London, 20(136): 438. 25 Sep 1872

genus valid

Genus Astromyelon Will. Proc. Roy. Soc. London, 20(136): 436. 25 Sep 1872

genus unavailable

Genus Calamopitus Will. 174, 177, 178.

genus valid

Genus Calcisphaera Will. Philos. Trans. Roy. Soc. London, 171(2): 521. 10 Nov 1880

genus valid

Genus Conostoma Will. ex Solms Einl. Paläophytol. 123. 1 Oct 1887

genus unavailable

Genus Conostoma Will. Proc. Roy. Soc. London, 25(171): 71. 18 May 1876

genus valid

Genus Dictyoxylon Will. 68.

genus valid

Genus Edraxylon Will. Proc. Roy. Soc. London, 20(136): 438. 25 Sep 1872

genus valid

Genus Lagenostoma Will. Nature, 12(307): 442. 16 Sep 1875

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