152 ' Confervoideae, Ulothrichiacetd, 



Propagatio zoogonidiis neutralibus '; duplicis formiie: inacrozno- 

 gonidia singula vel 2-4, rarius 8 intra cellulani matricalom orta, 4- 

 ciliata; microzoogonidia 8-16, rarius 32 et ultra, intra cellulam ma- 

 tricalem orta, biciliata (inter se copulantia vel sine copulationo germi- 

 nantia); propagatio otiam cellulis perdurantibus (aplanosporis, aci- 

 netis) 2). 



Generatio zygotis e microzoogonidiorum copulatione ortis tum 

 lente evolutis et sine periodo quietis individua nova (individua ita ge- 

 nerata nova microzoogonidia gignentia) efficientibus, tum post quietis 

 plus minus longam periodum lente accretis et e plasmatis simultanea 

 divisione 2-4-16 cellulas prnebentibus, e quibns, ut e microzoogoni- 

 diis neutralibus, individua neutra oriuntur. 



Conspectus generum 3), 



A. Cellula apicalis non attenuata. 

 Schizogotiium. Thallus aerophilus, (ilamentis lateraliter connatis constitutus; 

 chlorophora stellata. 



1) Haud raro occurrit ut zoogonidia jam intra cellulam matricalera inchisa 

 ^erminent. 



2) De relatione Ulotrichearum iraprimis gen. Hormidii et Schizogonii 

 cnm Prasiola, aliarura vero cum aliis ChJorophyceis valde evolutis Cfr. Hicks 

 The Diamorphosis of Lyngbya (Ulothrix) 1861, Moyen Ueber Priestley 'sche 

 griine Materie etc. in Linna^a 1827, Kuetzing Umwandlung niederer Algcnfor- 

 men in hohere :841, Phycologia generalis 1843 ct Phycologia germanica 18J5, 

 Wolie Freshwater Algae of the United States 1887, Hansgirg Uebor den Poly- 

 raorphismus der Algen etc. 



3) Genora vcro Conferva (L.), Microspora (Thur.), Urospora (Aresch.), 

 Binuclearia (Wittr.), qua3 in meo Couspectu gencrum Chlorophi/cearum 

 oraniura hucusque cognitorum (Notarisia UI, 1888, n. 10, pag. 448) inter U/o- 

 Irichiaceas enuraeravi, inter subfam. Conferveas m voluraine prajsenti lo- 

 cum teueant. Binuclcaria et Urospora, etsi nucleorura nuraero ad Cladn- 

 phoram appropinqucnt, otiam, ob cum Confcrva et Microspora afiinitatem, 

 a Cladophoraceis (Siphonocladiaccis Schraitz p. p.) sojunxi. E contrario 

 Chuilomorpham inter Ulolrichiaceas et Cladophoraceas dubiara puto. De 

 nucleis singulis cellularum Confervce et Microsporoi scripserunt nuper cl. La- 

 gerheim (Entwiclv. eiaig. Confcrv. 1888) et Wille (Algol. Mitthoil. 1887). E 

 contrario cl. Hansgirg (Flora 1888, n. 14-15), genera hacc aliaquc omnia su- 

 pra meraorata inter Confrrvoideas bi- multinucleatas disposuit. Conferva 

 et Microspora vero (etsi cellulas uninucleatas pr;ebcant) cellularum vegota- 

 tivarum rorraa pro morc clongata, mcmbranic siugulari ruptura a genui- 

 nis Ulotricheis primo obtutu sunt distingucndio ; rcpcriantur crgo iii subfa- 

 miliii ConferveiB (Bonnera.) Lagcrli. 



