242 BOTANICAL GAZETTE —— foctosrr 
ferentiated, the male becomes the spermatocyst and the female the 
oocyst. They are restricted to the thallophytes and are generally 
characteristic of the algae, but are not the only types of sexual organs 
found in this assemblage. 
Il. Multicellular structures developing wuninucleate gameles— 
These organs comprise the antheridia and archegonia of the bryo- 
phytes and pteridophytes, which have probably been derived from a 
multicellular structure whose gametes were sexually undifferentiated 
(isogamous), which structure would be included under the more 
general term gametangium. In a harmonious terminology based 
upon the gametangium the male organ might be called a spermi- 
tangium and the female an oangium. Gametangia are represented 
among the thallophytes by the so-called plurilocular sporangia. 
Spermatangia (antheridia) are found in the Charales and Dictyota. 
III. Multinucleate sexual cells or coenogametes.—These remark- 
able sexual organs, named by the author “coenogametes” (DAV 
’00, p. 307), are most typically illustrated in the Mucorales 
Gymnoascales, but are also found in a somewhat modified form i 
the Saprolegniales, Peronosporales, and certain Ascomycetes. Coeno- 
gametes are morphologically either gametocysts that have become 
changed directly into gametes, or they are restricted portions of such 
cells. 
These types of sexual organs will be consider 
brief summarized list at the end of the paper. 
ed in order, with @ 
I. GAMETOCYSTS, SPERMATOCYSTS, AND OOCYSTS- 
xual organs 
The terminology which we shall use for the simplest se 
of plants (unicellular structures. developing uninucleale gamelts) 4 
based upon suggestions of VUILLEMIN (’o2) presented for the ae 
of clearly separating this group from the multicellular reproduc 
organs characteristic of plants above the thallophytes- 
lular sexual organ is well known to have had its origin from 4 cae! 
ductive cell which produced asexual spores, and such may be wll 
a sporocyst consistently with the other terms. The hist of eo hetet- 
reproductive organs leading to the high sexual conditions of the the 
ogamous algae, such as Volvox, Oedogonium, bin: 
Cyclosporeae, and the Rhodophyceae, is then as follows: 
