Pteridophyten. 581 



ces especes l'auteur cree le nom: Alciconiuni Wilhehninae Reginae, 

 qui devrait etre applique ä la plante si les lois de priorite telles 

 qu'elles sont comprises par Underwood etaient en vigueur. ^/ff/j/zo- 

 glossum microphyllum n. sp.; Xenochlaena dubia n. sp.; Leptochüus 

 trifidus n. sp. L. Raapii n. sp. E. de Wildeman. 



Campbell, D. H., Sludies on the Ophioglossaceae. (Annales du 

 Jardin botanique de Buitenzorg. XXI. p. 138—194. PI. IX— XIX. 



1907.) 



At the end of the paper the autor gives the following summary: 



1. The spores of O. mohiccanuni germinated freel}'^ and promptly, 

 but did not proceed beyond a four-celled stage, owing, apparently, 

 to failure to become associated with the mycorhizal fungus. Germi- 

 nation in O. peiidulum was slower, but in a number of cases the 

 association with the fungus was established and growth continued. 

 Prothallia of twelve or thirteen cells were obtained in this species. 



2. No trace of Chlorophyll was found in O. pendulum, but in O. 

 moluccanum some of the young prothallia developed a few chloroplasts. 



3. Adult prothallia were found in 0. moluccanum and O. pen- 

 dulum. Also in an undetermined species from Hakgala, Ceylon. 



4. The gametophyte of all the species is subterranean and nor- 

 mally destitute of Chlorophyll, and radial in structure as described 

 by Mettenius, Bruchmann and Lang. It is ver^^ large in 0. 

 pendulum, and apparently capable of unlimited reproduction by 

 means of detached buds. In O. moluccanum it is short lived, proba- 

 bly living only for a Single season. 



5. The antheridium of all the forms examined agrees in its de- 

 velopment with the description given by Lang and Bruchmann. 

 The spermatozoids are very large and agree closely in their deve- 

 lopment with those of Equisetum. 



6. The archegonium most nearly resembles that of the Marat- 

 tiaceae. Two neck canal cells may be present, and there is always 

 a division of the canal cell nucleus. A ventral canal cell was de- 

 monstrated in O. pendulum. 



7. The basal wall of the embryo is probably transverse in most 

 cases, but in 0. pendidiun it often varies a good deal in position, 

 probably due to the very variable position of the archegonium. 

 There is also a good deal of difference in the degree of develop- 

 ment of the foot, which is derived apparently from the whole of the 

 hypobasal half of the young embryo. 



8. There are three t3^pes of embryo in the Ophioglossutns , viz., 

 the types of O. moluccanum, O. vidgatum and 0. pendtdum. In the 

 first, leaf and root only are developed. In the second, root and 

 stem, with a late development of the foliage leaf. In the third, 

 roots only. 



9. The definitive sporophyte in both O. moluccanum. and O. 

 penduluni is formed as an adventitious bud upon the root of the 

 embryo sporoph5^te. 



10. In 0. moluccanum the tissues of the cotyledon and primary 

 root are continuous, a"nd the structure of the axial vascular bündle 

 is essentially the same throughout — collateral in the leaf, monarch 

 in the root. The primary root of 0. pendulum is diarch, like the 

 later roots. 



11. The t3'^pe of embryo in 0. moluccanum is probably the most 

 primitive, and has its nearest analogy in that of the Marattiaceae 



