The ovules of the older gymnosperms.

[1] BERTRAND CE, ANN SCI NAT BOT, V7, P72

[2] LANG WH, ANN BOT, V14, P286

[3] RENAULT B, 1881, COURS BOT FOSSILE, P100

[4] On the structure and affinites of fossil plants from the Pal ae zoic rocks - IV The seed-like fructification of Lepidocarpon, a genus of Lycopiaceous cones from the carboniferous formation [J]. PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY OF LONDON SERIES B-CONTAINING PAPERS OF A BIOLOGICAL CHARACTER, 1901, 194 : 291 - U134

[5] SCOTT DH, 1900, STUDIES FOSSIL BOT, P436

[6] WARMING E, 1877, RECHERCHES REMARQUES, P21

[7] WEBBER HJ, 1901, SPERMATOGENESIS FECU

[8] NEW PHYTOLOGIST, V1, P60

[9] 1877, PHIL T, P233

[10] 1883, B SOC FRANCE, P293

[1] BERTRAND CE, ANN SCI NAT BOT, V7, P72

[2] LANG WH, ANN BOT, V14, P286

[3] RENAULT B, 1881, COURS BOT FOSSILE, P100

[4] On the structure and affinites of fossil plants from the Pal ae zoic rocks - IV The seed-like fructification of Lepidocarpon, a genus of Lycopiaceous cones from the carboniferous formation [J]. PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY OF LONDON SERIES B-CONTAINING PAPERS OF A BIOLOGICAL CHARACTER, 1901, 194 : 291 - U134

[5] SCOTT DH, 1900, STUDIES FOSSIL BOT, P436

[6] WARMING E, 1877, RECHERCHES REMARQUES, P21

[7] WEBBER HJ, 1901, SPERMATOGENESIS FECU

[8] NEW PHYTOLOGIST, V1, P60

[9] 1877, PHIL T, P233

[10] 1883, B SOC FRANCE, P293