APPENDIX 637 



studied the development of the spermatozoid, which does not differ 

 essentially from that of other Filicineae. 



P. 403. Both Arnoldi and Yasui found that the nucleus of the 

 spore cavity in Salvinia divides very much as in Azolla. 



P. 407. Yasui (i) states that a primary root is present but it is not 

 functional, and soon ceases to be recognisable, becoming merged with 

 the foot. 



P. 414. Yasui (i) confirms Heinricher's statement that the 

 tapetum in Salvinia is composed of a single layer of cells as in Azolla. 

 Like the latter there are but eight macrospore mother cells, instead 

 of sixteen as Juranyi states. According to Yasui there are sixteen 

 chromosomes in the spore mother cells, and the reduced number in 

 the spore is eight. 



P. 414. For Juranyi (i), read (2). 



P. 414. Footnote — " Macrospangium, " should be '^macrosporan- 

 gium." 



P. 426. For Arcangeli (i), read (2). 



P. 435. The marginal position of the sporocarp is especially evident 

 in M. poly car pa (see Allison (i) ). 



P. 442. Some interesting experiments bearing on the origin of 

 heterospory have been made by Shattuck (i) on Marsilia. 



P. 446. For Goebel (22), read (21). 



CHAPTER XII 



P. 446. The prothallium of Equisetum dehile is described by 

 Kashyap (i) as being radial in structure, and resembling that of 

 Lycopodiuni cernuum; but the figures and descriptions are not very 

 convincing, and it is quite as likely that a more careful investigation 

 would show no radical difference between E. dehile and the other 

 species that have been studied. The early stages resemble closely 

 those of E. telmateia, where (see text, Fig. 258) the young prothallium 

 sometimes shows a condition corresponding to what Kashyap calls a 

 '^primary tubercle." 



P. 447. In E. dehile (Kashyap (i) ) archegonia are formed first, 

 and later, on the same prothallium, the antheridia. 



P. 447. The development of the spermatozoids has been very 

 exhaustively studied by Sharp (i). He states that the blepharoplast 

 at one stage becomes broken up into a series of bead-like fragments, 

 which later fuse into a continuous thread. He also states his belief 

 that the blepharoplast is a further development of a centrosome. 



