Till Algernes Systematik. 3 
Scripsit Harvey (Ner. Bor. Amer. III. p. 34): ,The true Siphonaceze 
are typically known by being wholly formed of long, tubular branching 
cells. In the Dasyclade& the axis only is of this character; the rest of 
the frond consists, as in Conferva, of strings of short cylindrical cells; 
and the spores are of a higher type than in Siphonace&e. In Valoniacee 
tubular branching cells are found, if at all; only in the root, or in a 
spongy caudex, while the principal part of the frond is formed of con- 
fervoid filaments.” Equidem aliter omnino structuram interpretandam 
eredidi; hinc quoque aliter de differentiis indicatis judicavi. In omnibus 
is plantis, quas Siphoneis pertinere puto, adsunt revera tubi illi elongati 
plus minus ramosi, quos Siphonaceis characteristicos dixit Harvey, si tan- 
tum illos non semper cylindraceos postulaveris, sed quoque utriculos ven- 
tricosos, quin immo expansiones foliiformes, unica vero ceilula tubulosa 
constitutas, ab iis non alienas esse concesseris. Cellulis nimirum majori- 
bus, nunc maximis qgu&e inter plantas hucusque innotuerunt, omnes con- 
stituuntur; et cellule in radices, caules, ramos ramulosque expanduntur, 
pervio usu inter partes ita distinctas. Frondes omnium ab initio tubulose 
formantur; sub evolutione vero sepe dein intus obturantur vario modo; 
ita ut nunc diversa organa frondis plus minus composite, nunc ejusdem 
organi exterioris diversas partes invicem distinctas diceres; et orruntur 
demum hoc modo frondium cavitates secluse, celluleformes. Quod qui- 
dem valere puto non minus de Siphonaceis Harveyi, quam de partibus 
singulis Dasycladearum et Valoniacearum — ut ille has familias limitatas 
voluit. 
Ubicumque in Siphoneis generatur ramus, hic incipiatur semper expan- 
sione vesiculeformi membrane infra verticem partis generantis; facilius 
igitur patet inter utramqgue partem — generantem et generatam — esse 
ab initio pervium usum; sive postea pars generata abeat in ramum cylin- 
draceum, sive in utriculum ventricosum, sive in expansionem foliaceam. 
Que hoc modo generata sit pars nunc tantum directione mutata, aut basi 
paulisper constricta, externe -distinguatur (Bryopsis, plures Caulerpe et 
Valonicw, rami steriles Åcetabularic); nunc strictura basali profundiore, quin 
immo iterum iterumque sepe repetita, annulo gquasi prominulo stricturas 
intercedente, nova pars generata a generante evidentius distincta adpareat 
(rami Apjohmce, velut nonnullarum Caulerparum et specierum Penicilli); 
