Bower . — Studies in the Phytogeny of the Filicales . 431 
PLATE XXVIII. 
Fig. 17. Stenochlaena sorbifolia (L.), J. Sm. Similar sections, a, b y c, transverse sections, and 
d, a longitudinal section ; these show the flattened concave receptacle with ‘ Acrostichoid ’ spread 
over a large area; the identity of the sori is completely lost. e y f show indications of a flange, 
but it is not seen in g. All x 125. 
PLATE XXIX. 
Fig. 18. Brainea insignis (L.), J. Sm. Distal end of a pinna, showing the venation, and the 
relation of the non-indusiate sori to it. x 10. 
Fig. 19. Brainea insignis (L.), J. Sm. Sections of the pinna ( a-c ), showing that the initial 
stages closely resemble those of Blechnum , but with no sign of an indusial flap, x 125. 
Fig. 20. Blechnum fraxineum y Willd. d, apical region of a pinna, showing the venation, 
and its relation to the fusion-sori. e , a lower region, showing partial pinnae, I-VI. f shows 
details of the pinna, III in the preceding figure, under higher power. d y e x 2 ;/x 15. 
Fig. 21. Portion of a pinna of Blechnum Fraseri , Luerss., showing the relation of the venation 
to the commissure, x 15. 
Fig. 22. Part of a pinna of Blechnum capense (L.), Schlecht, showing the transition from the 
sterile to the fertile state, with disintegration of the fusion-sorus. x 2. 
Fig. 23. Apical region of a pinna of Blechnum spicant (L.), Wither, showing venation, and 
partial disintegration of the fusion-sorus. x 3. 
Fig. 24. Portion of a pinna of Blechnum cartilagineum, Sw. , showing disintegration of the 
fusion-sori. x 3. 
Fig. 25. Woodwardia areolata (L.), Moore. Part of a pinna transitional between sterile and 
fertile, showing vein-fusions, and the indusial flaps, here much reduced, x 2. 
PLATE XXX. 
Fig. 26. Doodia caudata (Cav.), R. Br. a-d, successive sections illustrating the development 
of the indusial flap and sorus. x 125. 
Fig. 27. Woodwardia radicans (L.), Sm. A similar section, showing an advanced state similar 
to that in Doodia or Blechnum brasiliense. x 125. 
Fig. 27 bis. Whole leaf of Blechnum punctulatum , var. Krebsii y considerably reduced. 
Fig. 27 Iris. Three pinnae of the same leaf, slightly enlarged, to show the soral arrangements. 
PLATE XXXI. 
Fig. 28. Blechnum punctulatum , Sw., var. Krebsii , Kunze. Portions of pinnae, showing 
different states of disintegration of the fusion-sorus. a shows a condition very near to the normal 
for Blechnum at the apex, but strongly arched outwards below, b shows a rather more advanced 
state of disintegration, c, d } still more advanced arching and disintegration, so as to resemble 
Scolopendrium. At x in these drawings extra sori are present, a-d x 2. e shows more in 
» detail the outward arching and disruption of the fusion-sorus. x 10. 
Fig. 29. Blechnum punctulatum , Sw., var. Krebsii , Kunze. Sections of young fertile pinnae, 
for comparison of g with the normal type of Blechnum as seen in Figs. 10-12, and of f, h with what 
is seen in Scolopendrium in Fig. 31. x 125. 
Fig. 30. Scolopendrium vulgar e, Sm. Portion of the lateral flap of a leaf, with midrib, showing 
the venation and sori. Slightly enlarged. 
PLATE XXXII. 
Fig. 31. Scolopendrium vulgare , Sm. a , b, successive stages in development of the sorus, for 
comparison with Fig. 29, f-h. x 125. 
Fig. 32. Asplenium obtusatum , Forst. Part of a pinna showing venation and sori. x 3. 
Fig. 33. Asplenium horridum , Kaulf. The same, x 3. 
Fig. 34. Asplenium serra y Langsd. et Fisch. The same, x 3. 
Fig. 35. Asplenium ( Diplazium ) celtidifolium , Kze. The same, x 3. 
Fig. 36. Asplenium obtusatum , Forst. Sections of fertile pinnae, showing successive stages of 
development of the sori. a and b x 125 ; c x 50. 
