Author:

Edwards,D.;Wellman,C.H.;Axe,L.

Year:

1999

Title:

Tetrads in Sporangia and spores Masses from the Upper Silurian and Lower Devonian of the Welsh Borderland

Reference:

Edwards,D. et al. (1999) Tetrads in Sporangia and spores Masses from the Upper Silurian and Lower Devonian of the Welsh Borderland Botanical Journal of the Linnean Society Vol. 130 # 2 P. 111- 156

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