CHLOROCLONIUM gen. nov. 



Thallus endophyticus in nonnullarum algarum muco vi- 

 gens, e filamentis alterne v. irregulariter ramosis, articu- 

 latis, constitutus; ramuli divaricati vel patentes, vegetatione 

 terminali prsediti; articuli vegetativi plus rainus elongato- 

 cylindracei, chromatophoro parietali, laminseformi, margine 

 irregulariter sinuoso- vel laciniato-substellato et pyrenoide 

 centrali amylifero ìnstructo. Ramulorum cellulse terminales, 

 subimmutatse, in zoosporangia evolutfe et zoosporas 4-8, 

 raro 2, cytioplasmatis divisione succedanea, foventes ; zoospo- 

 rse ovales, ciliis binis ocelloque laterale rubro praeditse, motu 

 sedato, mox germinantes et novos thallos ferentes. Filamen- 

 torum cellulse steriles,modo membrana sat crassa, firma, cin- 

 ctse et in hypnosporas (cystides) transmutat£e, modo in statum 

 monocellularem transeuntes et gonidia immobilia, globosa, se- 

 gregata, aut familias protococciforraes v. palmelloideas etFor- 

 mantes. Gonidiorum generationes indefinitse, cytioplasmatis 

 divisione repetite binaria ad tres directiones alternante zoo- 

 sporarumque ope sese augentes. Zoosporse 4-8-16-32 intra 

 gonidia ultimse generationis ortse, interdum zoogametis fun- 

 gentes et post copulationem in z3'gosporas evolut». Zygospo- 

 rarum evolutio adhuc ignota. 



1. Chi. elongatum n. sp. — C. filamentis late diffusis, ramis pa- 

 tentibus v. divaricatis valde elongatis, articulis diametro 2-4-pIo, raro 



