THE FEMALE GAMETOPHYTE 



81 



seems reasonable, but it must be noted that the rudimentary 

 plate occurs also at the third mitosis, and so may be a reminis- 

 cence of a much more remote ancestry with cellular prothallia. 

 In connection with the reduction division it is of interest 

 to note the number of chromosomes found among Angiosperms. 

 The following table, arranged in the Engler sequence of fami- 

 lies, although more extensive than any hitherto published, is 

 far from complete. The numbers in parentheses were inferred 

 rather than actually counted: 



The Number of Chromosomes recorded for Certain Angiosperms 



Plant. 



CHROMOSOME NUMBERS. 



Zostera marina 



Naia8 major 



Tritieum vulgar? 



Tradeseantia 



Eichhornia crassipes 



Pontederia cordata 



Chlorophytum Sternbergianum . 



F'nikia Sieboldiana 



Allium fistulosum 



ursinum 



' ' Cepa 



I/ilium 



" Martagon 



ii ii 



" camdidvm 



" croceum 



" philaddphicum 



" tigri 'mi in 



FrUilliirin imperialis 



" Meleagris 



Tulipa Gesneriana 



En/fli ron in in americamum 



Galtonia candicans 



Scilla non-scripta 



sibirica 



Muscari neglectum 



{'onvallaria majalia 



Trillium grandiflorutn 



" recwrvativm 



Leueojum vemum 



Alstroemeria 



" psiflacea 



Iris squalens 



Cim mi indica 



Cypripedium barbatum 



Ganieto- 

 phyte. 



6 



6 



8 



8 

 12 

 16 



8 



1-2* 

 24 



8 



8 

 ,si 

 12 

 12 

 12 

 12 

 12 

 12 

 12 

 12 

 12 



8 

 12 



8 



8 



8 

 24 

 16? 

 18 



6 



6 

 12 



8 



8 

 12 



3 

 16 



Sporophyte. 



12 

 12 



(16) 



16 



mostly 16 



(32) 



16 



(48) 

 16 



(16) 



. 16 



mostly 16 



24 



24 



24 



24 



24 



24 



•24 



24 



16 



24 



16 or less 



(16) 



variably 8-16 



4^ 



more than 16 



(36) 



12 



12 



(24, 



mostly 



16 



24 



6 



32 



16 



Observer. 



Rosenberg 92 

 Guignard 71 

 Overton 28 

 Koernicke 43 

 Strasburger 20 

 Smith 53 



Strasburger 20 

 Stra^burger 72 

 Strasburger 20 

 Guignard 26 

 Schaffner 55 

 Strasburger 20 

 Guignard 16 

 Sargant 41 

 Strasburger 20 



Schaffner* 



Strasburger 20 

 Guignard 26 

 Schn.-Thies 95 

 Schaffner 98 

 Schn.-Thies 95 

 Overton 28 

 Schn.-Thies 95 

 Strasburger 20 



i t 



Wiegand 80 



Atkinson 64 

 The author-. 

 < >verton 28 

 SI rasburger 10 



Guignard 26 

 Strasburger 72 

 Wiegand *° 



Strasburger 20 



Year. 



1901 



1899 

 1893 



1*96 

 isss 

 1898 

 1898 

 1888 

 1900 

 1888 

 1891 

 1898 

 1888 

 1884 

 1896 

 1888 

 l.v-s 



1897 



1897 

 1888 

 1891 

 1901 

 1901 

 1901 

 1893 

 1901 

 1888 

 1888 

 1900 

 1899 

 1902 

 1893 

 isss 



1891 

 1900 



1900 



18S» 



* One anther constantly 14. 



