Background and objectives: The main aims of this study have been finding out the antibacterial activity and preliminary phytochemical screening of some fern species. Methods: The antimicrobial activity of the methanol extracts of Polypodium interjectum Shivas, Polystichum woronowii Fomin, Polystichum aculeatum (L.) Roth., Dryopteris affinis (Lowe) Fraser-Jenk...

The RNA base analogues, 5-fluorouracil, 2-thiouracil, and 8-azaguanine, inhibit the growth of Dryopteris borreri, but do not prevent the transition from filamentous to biplanar growth. Transition, which occurs only when the filament has developed to 4 or 5 cells, may be considerably delayed, due to inhibition of filamentous growth, but it always occurs when the critical cell number of the filam...