110 5; Ji G. Agardh. 
XV. Chame&edoris Ment. 
Iconibus jam a Solandro datis satis constat plantam, quam Coralline 
Peniculi nomine primus descripsit, quasi duabus partibus, quas heteroge- 
neas facile diceres, compositam esse. Coma nimirum terminalis, filis plu- 
rimis adparenter Confervoideis constituta, sustinetur stipite tubuloso mo- 
nosiphonio transversim annulato, gqualem consimilem in pluribus Siphoneis 
obvenire novimus. Genus/”novum, his characteribus fundatum, primus con- 
didit Montagne (18542), quod tamen jam antea suboluit Lamourouxio. 
Idem paulo postea (1850) proposuit Duchassamg (Anim. Radiair. des An- 
tilles p. 28) sub nomine Cephalothrix, cujus species tres diversas quoque 
enumeravit, quas forma come terminalis precipue diversas statuit.  Utrum 
vero form&e hoc respectu diverse sint species proprie, an stadia evolu- 
tionis constituant, dubitare liceat. 
Si de Penicillis assumere opportet comam quandam jam in wmfantili 
planta evolutam fieri, contrarimum obtinere videretur in plantula Chame- 
doridis, cujus stipites erectiusculi, et numerosi, socialiter crescentes, initio 
coma destituti, longitudinem 2—3 pollicarem attingere dicuntur antea 
quam rami primari come excrescere incipiant. De hac evolutione se- 
quentia habet Harvey: When this (the annulated tube) has attaimed the 
height of 2—3 inches it ceases to grow longer; a septum is formed just 
below the summit and a new cell begins there to develope. This second 
cell is very short and again divides, once or twice, vertically; so that the 
original tubular cell (now te be calted the stipe) is crowned with 2 or 3 
minute cells placed one above the other, the terminal one beeing atte- 
nuated and pointed. These cells remain short and rudimentary, but from 
their nodes dense whorls of ramelli begin to grow" (Harv. Ner. Bor. Am. 
p. 43). Articulos ejusmodi plures in supremo vertice stipitis generari, a 
quibus ramorum verticilli (diversi) provenirent, mihi observare non con- 
tigit. Sectione facta longitudinali stipitis adultioris totum intus tubulosum 
observare credidi, membrana ambiente crassiuscula, membranulis numerosis 
composita; a facie observata quasi striis longitudinalibus membrana notata 
videtur. Si membranulam interiorem a supremo vertice stipitis separare 
contigerit, quod facilius fit, videre licet hanc membranulam non tantum 
