Conlervoidooe, Ulvaceoe, Ulvella. 147 



minis Papaveris vel Ervi magnitudinem metiens, snepius irregula- 

 ris, explanato-expansus, plorumque lubricus, pallide vel tlavesceti- 

 ti-viridis, ubique substrato adnatus, e cellularum stratis pluribus 

 (ad marginem ssepe tantum unico) constans, e filamentis denso sti- 

 patis, ramosis, radiatim dispositis, arcte conjunctis efFormatus; 

 chlorophora (in cellulis tenui-tunicatis) parietalia, laminaria, nu- 

 cleutn singulum, granuhi amylacea plura guttulasque oleosas inclu- 

 dentia. 



Propagatio gonidiis mobilibus et immobilibus e divisione ceHu- 

 larum singularum in 4-8 (raro IG) cellulas filiales efFormatis, dein 

 membrana soluta liberis ; zoogonidia 2 ciliis corpore circ, sesqui 

 longioribus, stigmate minuto rubro, vacuolis antice contractilibus 

 instructa. 



Obs. Nonnumquam adest status palmelloideus vel protococ- 

 coideus, 



1. Protoderma viride Kuetz. Phycol. gener. p, 295, Spec, Alg. p. 471, 357 

 Tabul phycol. VI, t. XI, f. 1, Rabenh. Krypt, Flor. v. Sachs. I, 

 p. 240, Fl, Eur. Algar, III, p, 307, f, 84, Hansg, Prodr. p. 225, 

 f. 123. — Tenui-membranaceum, pallide viride, primo rotundatum, 

 dein irregulariter conformatum ; filamentis plerumque ramulis late- 

 ralibus, brevissimis pra?ditis, in stratum subparenchymaticum plus 

 minus arcte coalitis, margine ramulis terrainalibus plerumque li- 

 beris ideoque conspicuis instructo; cellulis vegetativis in parte juve- 

 nili thalli plerumque longe cylindraceis vel cuneatis, rarius subglo- 

 bosis, saepe etiam irregularibus, 3-6 u-, latis, 2-3-pIo, raro 1-2-pIo 

 longioribus, tenui-tunicatis; cellulis in parte adultiori 6-8, rarius 

 12 u. latis, 1-2-pIo longioribus, globosis, ovatis, ellipticis vel le- 

 niterincurvis, crassiuscule tunicatis, sa^^pe utrinque membrana inie- 

 qualiter incrassata pra^ditis, contentum subtiliter granulosum, saipe 

 uniformem, pallide viridem includentibus.; zoogonidiis globosis vel 

 ovatis, 3-3,5 [x. latis; gonidiis immobilibus ovatis, ellipticis, ra- 

 rius spha^ricis, 2-3 a. latis. 



Hab. ad lapides lignaque in Germania (Kuetzing), in Austria 

 (L. Rabenhorst), in insula Cypro (Unger), in Boheraia (Hansgirg). 

 — Huc, teste cl. Hansgirg Prodr. II, p. 266, verisimiliter pertinet 

 Limnodictyon sp. Reinsch in Freshw, Algse frora the Cape of 

 Good Ilope p. 244, t. 6. 



ULVELLA Crouan [1859] Notice sur quelq, nouv, Algues marines in 



