. The origin of a land flora, a theory based upon the facts of alternation. Plant morphology. Fig. 324 bis. Hymenophyllztm Wilsoni, Hk. Sorus in longitudinal _ section showing the receptacle with divisions indicating inter- calary growth, and the first sporangia originating near the apex. X Fig. 325. Nos. 95, 96, 97, g8 = Sporangia of Hymenophyllum dilatatum. Swartz, seen respectively from the two sides (Nos. 95, 96), and from the central (No. 97), and peripheral (No. 98) faces. Nos- 90, 100, 101, io2=similar figures, to the same scale of Trichomanes radicans, Swartz. Nos. 99 and 100 sho
. The origin of a land flora, a theory based upon the facts of alternation. Plant morphology. Fig. 324 bis. Hymenophyllztm Wilsoni, Hk. Sorus in longitudinal _ section showing the receptacle with divisions indicating inter- calary growth, and the first sporangia originating near the apex. X Fig. 325. Nos. 95, 96, 97, g8 = Sporangia of Hymenophyllum dilatatum. Swartz, seen respectively from the two sides (Nos. 95, 96), and from the central (No. 97), and peripheral (No. 98) faces. Nos- 90, 100, 101, io2=similar figures, to the same scale of Trichomanes radicans, Swartz. Nos. 99 and 100 show the lateral views. No. 101 shows the central, and No. 102 the peripheral faces. All X so. 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. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Bower, F. O. (Frederick Orpen), 1855-1948. London, Macmillan and Co. , Ltd.
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