299 
cum formas utriusqiic maxime explicatas consideras, distin- 
ctas facile haberes. — Sporocarpia omnibus ignota. 
5. RnODOMENIA ' CRISTATA LiïlH. 
Thallo submcmbranaceo clrcumscripllonc suborblcularl-re- 
nlforml a basi palmato diebotomo, segmentis linearibus pinnato- 
palmatls Inclslsque, sporocarplis marginalibus, perltetragonidiis 
in apicibus. 
Fucus cristatus Herb. Limi. 
Fucus coccineus ß pusillus JJ^ahlenh. Fi. ijfipp. p. oOO. 
Spbacrococcus cristatus ////. 29. — Lipujh. ILjdr.p. 15. 
t. 4. D. 
Rbodomenia cristata Grev. Aly. Brit. p. 89. 
In Phyccls tenuioribus parasitica , in fundo petroso 6 — 10- 
orgyali extratacnlcnsi, a Rabusia meridionali c. extra Win- 
ga, secus totam oram Scandinaviae occidentalem v. c. extra 
Cbrlstlnebcrg, Grafvarne, Koster etc. Rabusiae; in mari Norve- 
glco, V. c. ad Flebbefjord (Rlytt), Molde atque Cbristiansund 
(Ipse), usque In JNordlandlam secundum fVahhuh. 1. c. — Jun. 
— Sept, a me lecta. 
Thallus ambitu suborbicularls 1. reniformis, coloris sang- 
vinel, unciam diametro aequans; segmenta 1. yg lineam lata. 
Peritetragonidia, quantum equidem .observavi, semper in apici- 
bus thalli, qua nota et forma thalli, nec non segmentorum 
angustia, a ceteris speclebus facile dignoscitur. 
6. Ruodomenia bifida Good. 
Thallo membranaceo diebotomo I. palmato-llsso , apicibus 
siibblGdis, sporocarplis marginalibus, perltetragonidiis per thal- 
lum sparsis. — Tab. III. C. 
Fucus bifidus Good, et TVoodiv. in Linn. Trans, v. 5. p. 159. 
t. 17. f. 1. (Grev.) 
