Sylloge algarum omnium hucusque cognitarum

528 Siplionecc, HydrogarftracocC, Botrydiuin.
vegetativa (h. e. proliferationibus globosis secedeutibus) tuai cellulis
radicalibus (aplauosporis).
Generatio zoogonidiis (isogametis) biciliatis, copulatione zygotuni
(isospora) nova individua gorniinando pra^bens efficientibus. Individuo-
i'uni ita generatoruiu contentus in aplanosporas nuinero indeterini-
natas srepius dein transmutatus; aplanosporne in raicrozoogonidia co-
pulantia dein transmutatae.
BOTRYDIUM Wallr. [1815] in Ann. bot. pag. 153 {Etym. botrydon
acervatim), Kirchn. Alg. Schles. p. 83, Rostaf. et Woron. Ueber
Hotrydium granulatum p. 15-10, Cooke Brit. Freshw. Alg. p. 112,
WoUo Freshw. Alg. U. S. p. 155, De-Toni e Levi Fl. Alg. Ven. III,
p. 93, Hansg. Prodr. p. 96, Ih/dyogastrum [1810] Desv. Fl. Angl.
p. 19 p. p.!, Rabenh. Fl. Eur, Algar. III, pag. 265, Rhizococcmn
Desmaz. in Aun. Scienc. Nat. Botan. ser. I. vol. XXII, pag. 217,
Protococcus sp. Kuetz , Vauclieria sp. auct., Tremella sp. Dillen.
et Huds., Coccochloris sp. Spreng., Ulva sp. auct., Linckia sp.
Web. — Pars thalli unicellularis e terra emergens vesiculosa,
acicula3 capitis magnitudine, apice rotundata, basi rhizoidibus plu-
ries ramosis, mollibus, hyalinis in terram penetrantibus instructa.
Multiplicatio inacro- et rnicro-zoogonidiis nec non cellularum divi-
sione vegetativa. Macrozoogonidia (asexualia) intra plantulas rnajores
Isete virides, aqua udas numerosa orta, ovoideo-oblonga, 2-
4-granulis chlorophyllaceis instructa, polo hyalino, vix acurai-
iiato ciliura singulum, longura gerentia, post brevi motus periodum
iinmobilia, cilio evanido, membranam forraamque globosain in-
duentia, magnitudine accreta et in terra uda formam Protococci
botryoidis evolutione peracta sumentia; macrozoogonidia e con-
trario sub aqua in cystas merabranain duplicein suinentia transfor-
uiata. Siccitate perdurante, contentus viridis vesicula} in rainis rhi-
zomorphis hypogaais abit ibique celluhc numerosae (celluhe radica-
les) membrana propria obvoluta), sa^pe moniliformi-seriata) effor-
niantur. II;x) celluhe radicales (aplanospora)) dein tura zoogouidan-
gia hypoga^a tuin plantulas vegetativas tuin hypnosporangia era-
dicata sistere possunt. Proliferationes thalli dein radicantes et scpto
discrotie a cetero thallo secedunt novasque plantulas eniciunt. Fxsic-
catione nimis exstanto, thalli meinbrana contrahitur ut contentus
chlorophyllaceus in cellulas (aplanosporas) primo virides dein ru-
fo-aurantiacas dividitur. Aplanospora} ha) tam virides quara auran-
tiaca» sub aqua sub zoogonidangia transformantur et e contontu