1906] OVERTON—THECOTHEUS PELLETIERI 459 
in the peripheral, dense, granular protoplasm of the ascus. Other 
scries of divisions usually occur and uninucleate spores are eventually 
formed. The details of spore formation have not been described by 
BarKER. The description of spore formation in this many-spored form 
will be of great value,and BARKER’s results will be awaited with interest. 
He is inclined to believe that the whole process of spore formation is 
intermediate between typical methods in sporangia and asci. 
MAIRE (:05) concludes that in Galactinia succosa, Pustularia 
vesiculosa, Rhytisma acerinum, Morchella esculenta, Anaptychia cili- 
aris, and Peltigera canina the first division of the ascus nucleus is 
heterotypical, and that the second division is homeotypical. In 
the prophases of the first division he finds a well-marked synapsis 
stage. The asci are formed by two different processes, one of which 
is characterized by the formation of a hyphal system sympodially 
branched, each cell of which is a synkaryon containing two nuclei 
Which divide by conjugate division. The binucleate terminal cells 
of these ascogenous hyphae become the asci. He believes that there 
is a tendency in the Ascomycetes to form a synkaryophyte analogous 
to that of the Basidiomycetes. MArIRE, however, has been unable 
to trace these synkaryons back to their first beginnings, which is 
highly important. In Galactinia the centrosomes and spindles have 
an intranuclear origin, while the polar asters have an extranuclear 
origin, developed independently of the intranuclear part. Nuclear 
beaks are formed in the process of spore delimitation. 
GUILLIERMOND (:05) finds that in Acetabula leucomelas and in 
Galactinia succosa the ascogenous hyphae form a series of binucleate 
cells, the end cells of which become the asci. Peziza catinus presents 
still another method of ascus formation, which he holds to be anal- 
ogous to that in P. vesiculosa. The terminal cells of the ascogenous 
hyphae are uninucleate, while the subterminal cells are binucleate. 
These binucleate <chienien cells bud out a lateral branch to form 
the ascus, which grows parallel to the filament, and in which nuclear 
fusion occurs to form the ascus nucleus. GUILLIERMOND has studied 
the behavior of the chromatin in the asci of Pustularia vesiculosa, 
Peziza rutilans, P. catinus, and Galactinia succosa, and believes that 
_ the first ascus mitosis is heterotypical, and that the first mitosis is 
Preceded by a synapsis stage. 
