. Bulletin of the British Museum (Natural History), Geology. Figs 13-14 Matonia braunii (Goeppert) comb, nov. Hillhouse Nab, Farndale. Fig. 13. Spore at the edge of the mass shown in Fig. 14, x 800. The shaded part is obscured by overlapping spores. Fig. 14. Spore mass isolated from a sporangium in situ, x 80. Some of the spores are outlined more definitely than is certain. estimate their number at about 100. The spores have smooth brown walls about 1-5 um thick and the one most clearly seen (Fig. 13) is figured. They are about 50 um wide. As the spores are coherent and smooth-walled
. Bulletin of the British Museum (Natural History), Geology. Figs 13-14 Matonia braunii (Goeppert) comb, nov. Hillhouse Nab, Farndale. Fig. 13. Spore at the edge of the mass shown in Fig. 14, x 800. The shaded part is obscured by overlapping spores. Fig. 14. Spore mass isolated from a sporangium in situ, x 80. Some of the spores are outlined more definitely than is certain. estimate their number at about 100. The spores have smooth brown walls about 1-5 um thick and the one most clearly seen (Fig. 13) is figured. They are about 50 um wide. As the spores are coherent and smooth-walled it is possible that they died before maturing and the fact that this was the only sporangium of the sorus which yielded spores also implies arrested development. Harris (1961) figured a similar spore from a Gristhorpe specimen and a smaller one from a Saltwick specimen, both as Matonidium. Discussion The indusium. I determined the new specimens in the field as Phlebopteris braunii because they agreed in every character visible with a lens. But when I made transfers and found that the sori 15. Figs 15-16 Matonia braunii (Goeppert) comb. nov. Hillhouse Nab, Farndale. Fig. 15. Partly fertile pinna in transfer, , x 3. The placentae are small and possibly abortive. Fig. 16. Longest available pinna fragment, sori obscure. , x Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original British Museum (Natural History). London : BM(NH)
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