658 Protococcoideoe, Palmellacea?, Oocardium 



Subfamilia quiiita Dictyosphaerieae. 



Diclyosphmriede [1888] De-Toni Consp. gen. Chloropli. in Notarisia III, n. 10, 



p. 451 non Kuetz. 

 Profococcoideue slipitatca Kirclin. [1878] Alg. Scliles. p. 105 p. p., Hansg.[1888] 



Prodr. p. 130. 



Cellulae singulse per pedicella brevia vel filamenta subtilia in fa- 

 milias raicroscopicas conjunctae. 



Conspectus generum ') 



.4. Celhilae 2-4 ad apices stipitis dichotorao-ramosi sitse. 



Oocardium. Cellulae in unoquoque stipite singulatim vol binatim acrogeua\ 

 ? Bauckia. Cellula} in unoquoque stipite gemina',una acrogena, altera pleu- 

 rogena. 



B. Cellulai ad apices filamentorum subtilium in familiam globosam vel ellipsoi- 

 deam cavam dispositffi. 



Dictyosphcerium. CellulaB oblonga^, ovales vel reniforraes, filamentis subtilibus 



e centro ad peripheriara radiantibus fultae. 

 Selenosphunrium. Cellulse subreniforraes, obcordatae, bilobae, vertice utrinque 



in mucrones binos excurrentes, basi in stipites tenues abeuntes. 



Genus minus notum. 



Actidesmium. [Genus quod ad sedem incertum, ad Mischococcum vergens at 

 liberura nec adflxum]. 



OOCARDIUM Naeg. [1849] in Kuetz. Species p. 196, Gattungen ein- 

 zelliger Algen p. 74, tab. III A (Etym. oon ovum et cardia cor), 

 Rabenh. Fl. Eiir. Algar. III, p. 76, f. 27. — Thallus crustaceus, 

 induratus, verrucosus, pallide viridis, intus radiatim striatus. Cel- 

 lul?e subovales, utroque polo leniter emarginat?e, stipitatae, chlo- 

 rophoro centrali, basi locello achroo soepe instructa3. Stipites e te- 

 gumentis gelatinosis formati, tubulosi, dichotome vel trichotome 

 divisi, fastigiati, dense coaliti, calce copiose pr?egnantes, apice cel- 

 lulas singulas vel geminas gerentes. 



Collularum divisio directione in duas dimensiones alternante. 

 Generationes omnes evolutse. 



I. Oocardium stratum Naeg. Alg. p. 76, t. III A, Kuetz. Species '549 



1) Genus Cosmocladium Br^b. inter Desmidieas disposui. 



