Do.-., mifil V rsil rKAWA.— TTTE NUMnKR OF ClITiOMOSOMKS. 4Lo 



P. commune 6 



\V()()i>i!UKN ; Anil. IJol. 21). 11)15. 



P. juniperinum. 6 



Allkn ; Arcli. Zcllforsch. S. 1<)1_'. 

 Arens ; Bot. Cenlralbl. 107. 1908., Inaug.- 

 Di.ssert. Bomi. 1907. 



P. piliferuin.-'- 6 12 



J. «!<: \V. VAN Lkeuwen-Reijuvan ; Rcc. Trav. 

 Bot. Ncerlandais. 4. 1907. 



Atrichum aiigustatum 8 



Ikeno ; Biol. Centralbl. 24. 1904. 



A. undulatum 16 or often 17 



WiLLSON ; Anil. Bot. 25. 1911. 



Pogonatum rhopalophorum 8 



Ikeno; Biol. Centralbl. 24. 1904. 



Amblystegium riparium 24 



A. irriguum 12 



Em. Marchal ; Bull. Soc. Ro\^ Belgique. II. 

 1. 1912. 



A. serpens 10-12 18-22 



El. et Em. Marchal ; Bull. Acad. Roy. 

 Belgique. CI. Sci. 1909. 



12 



A. serpens bivalens 24 



E.M. Marchal; Bull. Soc. Roy. Bot. Bel- 

 gique. II. 1. 1912. & Bull. Acad. Roy. 

 Belgique. 9-10. 1911. 



PTERIDOPHYTA. 



Pteris aquilina 32 64 



Stevens ; Ber. Deut. Bot. Ges. 16. 1898. 



P. multifida ±64 



Adiantum cuneatum "^64 



DE Litardiere ; Compt. Rend. Acad. Sci. 

 Paris. 154. 1912. 



* According to J. & VAX W. Lkeuwen-Reijuvan, in Polytricbum pilifentm, Jun- 

 iperianum, formosum and commune, tho liaploid number is reduce 1 by one more reduc- 

 tion dis'isiun, resulting in the uncleus wiiich cuntiiins ;J chromosomes; but tlie cases 

 except in 7^. piUfernm were re-examined by Allen, Ai:i:ns, Walker a d Wooubcrs, 

 who agrc' d that tiie curious results obtained by VAX Lkeuwex-Keijuvax were likely 

 due to their misinterpretation. 



