41 Mr. Brown s Account of a new Genus of Plants , 
the theca? either above or below the connecting filament; in an 
increased number of divisions of each theca by longitudinal, 
transverse, or oblique processes of the receptacle of the pollen, 
as in several genera of Or chide ce and Laurina ; or in the per¬ 
sistence of part of the cells in which the pollen is formed, as in 
JEgiceras. 
Reduced and increased development of different parts may 
co-exist in the same organ, as in the bifid or incumbent anthera 
with contiguous thecre ; in the extraordinary dilatation of the 
connecting portion of the filament, while one of the theca? is abor¬ 
tive or imperfect, as in the greater number of Salviee; or in the 
theca? being confluent, while the polliniferous cells are at the 
same time persistent, as in certain species of Piseum. 
The deviations from the regular mode of bursting are also nu- 
merous; in some cases consisting either in the aperture being 
confined to a definite portion, generally the upper extremity, of 
the longitudinal furrow, as in Dillejiia and Solanum ; in the apex 
of each theca being produced beyond the receptacle of the pol¬ 
len into a tube opening at top, as in several Ericinee ; or in the 
two thecee being confluent at the apex, and bursting by a com¬ 
mon foramen or tube, as in Tetratlieca. In other cases a sepa¬ 
ration of determinate portions of the membrane takes place, either 
the whole length of the theca, as in Hamamelidece and Berberidea; 
or corresponding with its subdivisions, as in several Laurince; or 
lastly, having no obvious relation to internal structure, as in cer¬ 
tain species of Rhizopliora. 
The regular structure may also be altered or disguised by the 
union of two or more stamina ; the theca? of each anthera either 
remaining distinct and parallel, as in Myristica , Canella , and in 
several Aroidece ; being divaricate and united, as in Cissampelos ; 
or absolutely separate, by division of the filament, as in Cono- 
spermum and Synaphea. 
It 
