APPENDIX 3 



GENERAL SUMMARY OF THE PRINCIPAL 

 NEW FACTS RECORDED 



( 1 ) Chromosome counts have been given of all known British members of the Pterido- 

 phyta and of some non-British species and hybrids together with almost all known 

 examples of ferns with apogamous life histories. 



(2) Allopolyploidy has been demonstrated or strongly suggested in the following 

 normal taxonomic species : 



Dryopteris Filix-mas (L.) Schott sens. strict. emend. (Chapter 4). 



Cystopteris fragilis (L.) Bernh. in part (Chapter 7). 



Polypodium vulgare L. in part (Chapter 8). 



Polystichum aculeatum (L.) Roth (Chapter 9). 



Scolopendrium hybridum Milde (Chapter 9). 



Woodsia alpina (Bolton) Gray (Chapter 9). 



Doodia caudata (Cav.) R.Br. (Chapter 12). 



(3) Allopolyploidy has been demonstrated or suspected in all sufficiently investigated 

 apogamous species (Chapter 11), namely: 



Cyrtomium falcatum auct. ( ^C.falcatum Presl, Fortunei }.?im. and caryotideum Presl) 



Dryopteris atrata [V^ 3.\\ich) Ching 



D. Borreri Newman 



D. remota A.Br. 



Pteris ere tic a L. 



Pellaea atropurpurea (L.) Link 



Asplenium monanthes L. 



(4) Further work with a view to taxonomic revision is required to establish the nature 

 of the following new forms : 



Diploid Dryopteris dilatata (Chapter 5). 



Diploid D. Villarsii (Chapter 5). 



Diploid Asplenium Trichomanes (Chapter 6). 



Asplenium Adiantum-nigrum var. acutum (Chapter 6). 



Various segregants from Polypodium vulgare (Chapter 8). 



Various segregants from Cystopteris fragilis (Chapter 7). 



(5) The following naturally occurring sterile hybrids have been examined and their 

 nature discussed : 



Dryopteris uliginosa (Newman) Druce (Chapter 5). 



D. dilatata (Hoffm.) A. Gray x D. spinulosa (Mull.) Watt (Chapter 5). 



'Z). remota Moore', from Windermere (Chapter 5). 



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