32 



DIAGNOSES ALGARUM NOVARUM 



Chlorophyceaì 



I. OSTREOBIUM Boni, ot Fiali, in Ball. Snc. Boi. Fr. 1800, p. CLXl. 



— Filamenta continua, siphonacea, rainis latei-aiibiis in ramos ail- 

 pressos, divaricatos, in reti(?ulam anguste lacunosiim implicatos 

 divisis. 



Thallus in conchas penetrane. 



1. Ostreobium Queketti Bora, et Fiali. /. e. t. IX, f. 5-8, Algcv sp. in 

 Anomia Ephipphw vigens Quekett LecL on Histol. voi. II, p. 270, 

 f. 162. — 0. filamentis primariis 4-5 a. latis, tennioribus 2 y.. 

 latis, sub conclia3 stratu superficiali bine inde arapuUifornii-inflatis 

 et bic 20-40 u. et ultra latis; plasmate chlorophyllaceo laminam 

 interruptam dfd tubi parietem appositam efficiente. 



Hai), in concbis Ost rere edulis ad (( Croisic o (Rornet, Fla- 

 itault), ad (c Brest ))(L;E Dantec) et ad oras Normandise{DANGEARD). 



)l. ZYGOMITUS Born. et Fiab. in Bull. Soc. boi. Fr. 1890, p. CLXL 



— Filamenta septata, anastomosantia et tunc ex[!ansiones paren- 

 cbymaticas efficientia; tliallus in concbas penetrans. 



Obs. Genus imperfecte scrutatum ob specimina manca, quoad 

 lociim systeraaticum ergo dubium. 



2. Zygomitus reticulatus Born. et Flab. /. e. i. IX, f. 1-4. — Z. 

 filaniontis irregularibus, 4-6 ;/. latis, ramosis, per ramulos inter se 

 conriexis - t tunc reticulum areolas inasquales linquentem efficien- 

 tibus; articnlis diametro a^qualibus vel 2-o-plo longioribus, septo 

 Sccpe obliquo, in ramulis etiam s?epe longitudinaliter septatis. 



Hab. in coiicbis, socia Uyellà ccespilosd (Bornet, Flahault). 



Oyanophyceae 



3. Plectonema terebrans Born. et Flah. in Bnll. Soc. Boi. Fr. 1890, 

 p. CLXllI, t. X, f. 5-G. — P. filamentis tenuissimis, 0,05-1,5 [j.. 

 latis, 200-300 u.. longis, leniter flexuosis, ubique wquicrassis, in 

 directiones diversas implicatis, bine inde pseudo-ramosis ; vagina 

 tenuissima, acbroa, jodi ope non cffirulescente ; cellulis 2-6 u.. lon- 

 gis, utrinque granulo refringenti pra:;ditis. 



