172 BOTANICAL GAZETTE [AUGUST 
estimate rather than an.exact count. All of the Myxomycetes show 8 as the x 
number; in the diatoms only 3 genera are cited, the x numbers being 4, 8, and 
64, the latter with 128 as the 2x number; in the Conjugatae 12 is the prevailing 
number, and in most cases the 2x is not cited; in the Chlorophyceae the x 
numbers are various, ranging from 6 to 32, but no 2x numbers are given; in 
the Phaeophyceae the x numbers are 16, 18, 22, 24, and 32, with the expected 
2x numbers; in Characeae the x numbers are 21 and 16, but no 2x numbers are 
cited; in Rhodophyceae 8 forms are given, with x numbers ranging from 7 to 24 
and with the corresponding 2x numbers. In the fungi the numbers are low 
and the 2x numbers are given in comparatively few cases; the minimum + 
number is 2, and it has been noted in 2 species; 4 appears in 24 species; 
few have more than 8 as the x secsebiiigg and ae maximum number (16) is cited 
in 6 cases. In the bryophytes 8 ber, having been noted 
in 12 species, while 4 has been counted i in S species, and Lag in one case and 6 in 
another. The all cases. - oa 
the x number ranges from 6 to 24, with 6 ( conited tat species) 
number. In the pteridophytes the numbers are comparatively high, the x 
number ranging from 4 to 120, and 24 of the 35 species cited have 32 or more, 
while only one (Salvinia) shows the minimum number. In the gymnosperms 
12 and 24 have appeared so constantly as the x and 2x numbers that any 
other countings need to be very thoroughly ‘supported; 34 species with 12 as 
the x number are cited, and 3 which 
known to have 12, ‘Deck there aie 15) 6 necies is which the seuer § he oot 
been disputed. Otter tipabers are 6, 10, and 16. okies aman Ree: 
28 are devoted to angiosperms. 3 in Crep 
| to 45 in Chrysanthemum arcticum. Tick ce Gece take oa 
” ledons than in monocotyledons, and the most frequent + numbers are 8, 12, 
and 16. — 
‘he lists valuable not only forthe systematically arranged citations of 
one marae 2 
the c erate which the chrome apps ter 8 
- CH AMBERLAIN, : 
: ;: sit Se SET | feature CHARLES : 
¥ ig, uae : 
