LIST OF PLATES. 



Plate i. 



1. Two spores oi Ophioglossutn moluccanum Schlecht, showing range in size, x 500. 



2. Two-celled gametophyte of 0. moluccanum. 



3. A three-celled stage, sp, ruptured spore membrane. 



4. A four-celled stage seen from above. 



5. Two transverse optical sections of a four-celled gametophyte. 



6. Three-celled gametophyte of 0. intermedium Hk. 



7-9. Young gametophytes of O. pendulum L., showing mycorrhizal infection, m, mycorrhizal 

 filaments. 

 10. Adult gametophyte of O. mo/uccanum. X 10. <, basal tuber; 6 , antheridia. 

 11-14. Gametophytes of 0. pendulum. X 3. b, adventitious buds; sp, young sporophyte. 



15. Upper part of ripe antheridium of 0. pendulum. X 275. o, opercular cell. 

 16-20. Development of the spermatozoid in 0. moluccanum. x 950. hi, blepharoplasts. 



Plate 2. 



21-29. Spermatogenesis in Ophioglossum pendulum, x 950. 21 shows spermatocyte before final 

 nuclear division, with two blepharoplasts, hi ; 22, 23, nuclear spindle from side and pole; 

 24-29, development of spermatozoid; n, nucleus of spermatozoid; c, cilia; v, protoplasmic 

 vesicle. 

 30-32. Three stages in the development of the archegonium of O. pendulum. X 275. i, basal cell; 

 «', n^, neck canal cells. 

 33. Venter of the archegonium, showing apparently a ventral canal cell, v; «, one of the nuclei 

 of the neck canal cell, x 650. 

 34-37. Spermatogenesis in B. virginianum; 38-41, in Kauljussia; 42, 43, in Danaea. All x 950. 



44. Nearly ripe spermatozoids oi Angiopteris. x 950. n, nucleus; bl, blepharoplast; c, cilia; 



V, vesicle. 



45. Nearly ripe archegonium of Dancea, showing apparent ventral canal cell, v. 



46-48. Recently fertilized egg-cells of Dancea. sp, spermatozoid ( ?) within the egg-nucleus. 



Plate 3. 



Ophioglossum moluccanum Schlecht. 



Several types collected at Buitenzorg, Java, and referred to O. moluccanum Schlecht. There are 

 at least three species. Fig. 5 is the typical O. moluccanum. All figures about natural size. 



Plate 4. 



A. Six plants of Ophioglossum (Ophiodermd) intermedium Hk. reduced one-half. Collected at 



Buitenzorg, Java. 



B. Ophioglossum (Ophioderma) pendulum L., collected in the Hanwella Reserve Forest, Ceylon. 



1, 2. Full-grown spoTophytes of 0. pendulum, much reduced. In 2 the sporangial spike, sp, is 



forked. 

 3—6. Details of the sporophyll and sporangiophore. 



Plate 5. 



Ophioglossum (Cheiroglossa) palmatum L., collected in Jamaica. 

 I. The whole plant. 



2, 3. Sporophylls. In 3 there is a single median spike. 



Plate 6. 



A. I, Botrychium ohliquum Mijhl.; 2, B. lunaria L. 



B. B. virginianum (L.) Swz. 



Plate 7. 



Botrychium silaifolium Pr. California. 



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