HYMENOPHYLLACEAE 



579 



FIG. 324 bis. 



Hymenophyllum Wilsoni, Hk. Sorus 

 in longitudinal section showing the 

 receptacle with divisions indicating inter- 

 calary growth, and the first sporangia 

 originating near the apex. X 100. 



FIG. 325. 



Sporapgia of Hymenophyllum dilatatum. Swartz, seen respectively 

 (Nos. 95, 96), and from the central (No. 97), and peripheral (No. 98) 

 faces. Nos. 90, 100, 101, 102 = similar figures, to the same scale of Trichomanes 



Nos. 95, 96, 97, 

 from the two sides (Nos. 95, 96), and from the 



radicans, Swartz. Nos. 99 and 100 show the lateral views. No. 101 shows the central, 

 and No. 102 the peripheral faces. All X 50. 



the annulus varying between 20 and 25. There is also a greater simplicity in 

 the region of the stomium, which in Trichomanes is represented by two cells 

 only. No. 102 represents the "peripheral" face, the thin-walled region being 

 surrounded by the annulus, which takes the form of a twisted hoop. This 

 twisted form is clearly shown in No. 99, which demonstrates also the relation 



