196 CYTOGENETIC STUDIES IN DRYOPTERIS SPINULOSA : I 



(a) "D. dilatata" (2n-Scotland). (b) Hybrid (3n) " D. dilatata" (c) Hybrid (3n) " D. dilatata " 



(2n-Scotland) X D. dilatata (4n). (2n-Scotland) X D. spinulosa. 

 Fig. 2. Silhouettes of specimen fronds, as labelled (quarter natural size). 



(a) " D. dilatata" (2n-Madeira). (b) Hybrid (3n) " D. dilatata" (c) Hybrid (3n) " D. dilatata" 



(2n-Madeira) X D. dilatata (4n). (2n-Madeira) X D. spinulosa. 

 Fig. 3. Silhouettes of specimen fronds, as labelled (quarter natural size). 



