1906] OVERTON—THECOTHEUS PELLETIERI 461 
developed from the terminal cells of these hyphae, as described by 
Marre for Galactinia succosa. These authors have not made a 
detailed study of the nuclear phenomena, but believe that spore forma- 
tion is essentially the same as described by HARPER. 
Ramtow (:06) finds that the single ascus of Thelebolus stercoreus 
arises directly from the ascogonium, as in Spaerotheca. The two 
primary ascus nuclei fuse, and the resulting nucleus by successive 
divisions forms an enormous number of free nuclei. The details of 
karyokinesis have not been followed, although he satisfied himself 
that the divisions are indirect. The nuclei are evenly distributed 
inthe ascus. The phenomena of spore formation were not accurately 
determined, but Ramiow, basing his conclusions on the appearance 
of the protoplasm, which does not cleave as in the sporangium of the 
Phycomycetes, the appearance of an epiplasm, and the position of the 
nucleus at one end of the young spore, believes that the process of 
spore formation is by free cell formation, just as in Erysiphe. 
THE NUMBER OF CHROMOSOMES RECORDED IN ASCOMYCETES. 
Plant percent rene Observer Year 
Aleuria cerea........... hae 8 Guilliermond 1903, 1904, 190§ 
Anaptychia ciliaris.......... 4 Dangeard 1903 
Anaptychia ciliaris.......... 8 Maire 1904, 1905 
Anaptychia ciliaris.......... 8 Guilliermond 1905 
Ascobolus furfuraceus....... 8 Harper 1895 
Ascobolus furfuraceus....... 4 Dangeard 1903 
Ascodesmis nigricans....... 4 Dangeard 1903 
End arpon miniatum ...... 4 Dangeard 1903 
Erysiphe co Nissen 8 Harper 1900 
Galactinia succosa.......... 4 aire 1903, 1904, 1905 
Galactinia succosa.......... 8 Guilliermond 1905 
Hydnobolites sp............ 40r5 aull 1905 
Hypomyces Thiry. 4 e 1905 
Morchella esculenta........ 4 Dangeard 1903 
Neotiella albocincta......... 6 or 7 a 
Otidea onotica............. 8 Guilliermond 1903, 1904 
Peltigera canina............ 4 e 1904, 1905 
Pevita catinus,.,.....¢.. 12 Guilliermon 1903, 1904 
Peziza catinus............. 16 Guilliermond 1905 
Peziza rutilans............. 12 jermon 
eziza rutilans............. 16 Guilliermond 1904, 1905 
Peziza Stevensoniana....... 8 Harper 18 
Phyllactinia corylea......... 8 Harper 1905 
yronema confluens........ Io Harper Tg00 
Onema confluens........ 4 Dangeard 3 
Pustularia vesiculosa......... Pi aire 1904, 1905 
Pustularia vesiculosay i345 8 Guilliermond 1905 
ytisma acerinum......... 4 aire 1904, 1905 
Ryparobius Sp. ee 8 (?) Barker 1904 
Sphaerotheca castagnei..... 4 Dange te 
See kc ees 
