394 
DR JOHN M‘LEAN THOMPSON ON THE 
9. The anatomical state and the sporangial condition are shown to be of the 
Gymnogramme type. 
10. The anatomical state would allow of comparisons with the Cheilanthinse, but 
the sporangial characters of the latter make a view of near affinity with this group 
untenable. 
11. Certain points which emerge from the discussion of the Cheilanthinse have a 
bearing on a possible development of heterospory. 
12. The general conclusion drawn from the study of Trismeria is that it should 
not be considered a distinct genus, but an “ Acrostichoid ” Gymnogramme. 
IV. 
From the general survey of the plants discussed it is concluded that these 
Ferns constitute a laxly associated group which would best find its place phyletically 
as derivatives from some Schizseaceous source. 
DESCRIPTION OF FIGURES IN TEXT. 
Figs. 1-7. Jamesonia, Hk. et Gr. 
Fig. 1. A series of diagrammatic figures showing the distribution of tissues of stem of J. scalaris, Kze., 
cut transversely at levels between stem-apex and second leaf-base. Vascular tissue black 1 , sclerotic ground- 
tissue hatched. (x8.) 
Fig. 2. A series of diagrammatic figures of transverse sections of a branched stem of J. scalaris, Kze., 
showing the distribution of tissues at levels below (a) to ( i ) and above (j) the point of branching, l.t. leaf- 
race ; r.t. root-trace ; st. stele. ( x 8.) 
Fig. 3. Diagrammatic figures of pinnae of J. scalaris, Kze. (a) and ( b ) sterile pinnae seen from below and 
above, (c) and ( d ) fertile pinnae seen from below, and showing the distribution of the sporangia. ( x 8.) 
Fig. 4. Diagrammatic figures of pinnae of J. verticalis, Kze. (a) large fertile pinna seen from below, 
and showing the distribution of the sporangia on and between the veins , ( b ) a small basal sterile pinna seen 
from above. ( x 8.) 
Fig. 5. Diagrammatic figures of sterile pinnae of J. cinnamomea, Kze., seen from below and above. ( x 8.) 
Fig. 6. Diagrammatic figure of sterile pinna of J. canescens, Kze., seen from above. ( x 8.) 
Fig. 7. Transverse section of pinna-margin of J. scalaris, Kze. ( x 60.) 
Figs. 8-15. . Llavea cordifolia, Lagasca. 
Fig. 8. A series of diagrammatic figures showing the distribution of tissues of stem cut transversely 
at consecutive levels. Stele and leaf-trace black with a dotted border; root-traces black with a plain 
border. ( x 4.) 
Fig. 9. Diagram of leaf-trace form as in transverse section towards the base of the petiole : xylem, 
black ; phloem, hatched ; protoxylems, p. ; endodermis, a continuous line. ( x 20.) 
Fig. 10. Diagram of leaf -trace form as in transverse section at a point of departure of a pinna-trace : 
protoxylem, p. ( x 20.) 
Fig. 11. Diagram of leaf-trace form as in transverse section immediately after departure of a pinna-trace : 
protoxylem, p. ( x 20.) 
Fig. 12. Diagrammatic figures of sterile pinnule. ( x 3.) 
