Fig. 20: Thelypteris paliistris: a, upper part of frond, X 1/2; b, rootstock, X 1/2; c, 

 pinnae showing one fertile pinnule, X 5; d, sporangia before spores are released, X 

 10; e, sporangia after rupturing and releasing spores, X 10, (V.F.). 



