Smithsonian Report, 1918. — Berry 



Plate 2. 



Fig. 15.— Details of Organization of Some of the Different Types of Seed 



Ferns. 



1. Calymmotheca stangeri Stur. Involucres of megasporangia or seeds (after Stur). 



2. Restoration of Lagenostoma lomaxi (after Oliver). 



3. Microspores of Lagenostoma ovoides (after Benson). 



4. Lagenostoma lomaxi in median longitudinal section (after Oliver). 



c, micropyle; d, space between nucellus and integument; e, cupule; f, integument; ch, chalaza. 



5. Sphenopteris hoeninghausi (after Schimper). 



6. Lagenospermum sinclairi (after Arber) 



7. Neuropterocarpus kidstoni (after Kidstonj. 



8. Sphaerostoma ovale (after Benson): 



c, cupule; e, f, integument; v, vascular bundle in integument; n, upper part of nucellus; m, megaspore; 

 a, archegonia. 



9. Sterile pinnae of Aneimites fertilis from the Pottsville of West Virginia (after White). 



10. Seed bearing pinnae of the preceding. 



11. Median longitudinal section of Trigonocarpus parkinsoni (after Scott). 



12. Transverse section of preceding: 



Sa, sarcotesta; Sc, sclerotesta; if. inner flesh; mi, micropyle; m, megaspore and prothallus; Pe. pollen 

 chamber; v, vascular bundles; t, tracheal disk; nt, tracheids of nucellus. 



13. Seed bearing pinnules of Pecopteris (after Grand'Eury). 



14. Pterispermostrobus bifurcatus from the Carboniferous of New Brunswick (after Stopes). 



