ei 
er 
246 BOTANICAL GAZETTE [ocromm 
names proposed for the other great class of sexual organs, the mullti- 
cellular structures? The principal reason for the present suggestion 
is the desirability of naming unicellular structures in a manner indica- 
tive of their morphology. A better set of names would have been 
sporocyte, gametocyte, spermatocyte, and oocyte, but the last two 
terms have a special and precise significance in zoology. There is 
no evidence of exact correspondence between the events of spermato- 
genesis and oogenesis in animals and plants, but on the contrary 
many reasons for believing that the processes have not only had an 
independent origin, but have developed along quite different lines 
This subject cannot be treated at this time, but for these reasons we 
have avoided the term spermatocyte and oocyte, and instead have 
made use of VUILLEMIN’s suggest ons. 
II. GAMETANGIA, SPERMATANGIA, AND OANGIA. 
The second group of sexual organs comprises multicellular sire 
tures which develop uninucleate gametes. The fully differentiated 
organs are best illustrated by the antheridia and archegonia of the 
bryophytes and pteridophytes, but these heterogamous conditions 
must have arisen from a simpler type of gametangium, and this must 
be sought among the thallophytes. The writer (DAvIS ’03) has 
recently suggested their origin from a type of structure something 
like that of the plurilocular sporangium of the Phaeophyceae a 
the multicellular fruiting branches of such green algae as Schizome™ 
Stigeoclonium tenue irregulare, and the conditions sometimes found 
in Draparnaldia and Chaetophora. 
It will be difficult to displace such firmly established yen f 
antheridium and archegonium, but a terminology may be ae 
with sporangium and gametangium as a basis which is as cons! : 
and harmonious as that proposed for the first group i 
would be as follows: | 
Gametangium, a multicellular organ producing uninucle 
Spermatangium (antheridium), a multicellular organ prod 
Oangium (archegonium), a multicellular organ producing eggs 
’02). 
pee ; 
