58 
RoPEE; on the genus Licmophora. 
Marine on Zostera and small Algse. 
Syn. Licmophora flabellata^ Ag., Consp., 1830, p. 41. 
Hooker's Br. El., ] 833, p. 408. 
Wyatt's Fl. Danm., vol. v. No. 234. 
Har., Br. Alg., 1841, p. 206. 
Kiitz., Bac, 1844, t. 12, f. 1, 2, 3, 4. 
„ Sp. Alg., 1849, p. 113. 
„ Phy. Ger., 1845, p. 108. 
Exillaria flabellaia, Grev., Sc. Cryp. El., 1827, t. 289. 
iJcMnella flabellata, Carm. MSS., 1826. 
Ehr., Infus., 1838, i. 19, f. 1. 
Bail, Sil. Jour., 1842, vol. xliii, i. 5, f. 8. 
Licmophora Meneghiniana^ Kiitz., Bac, ] 844, p. 123. 
„ argentescem^ Ag., Consp., 1830, p. 41. 
Ag., Ic. Alg. Eur., 1835, t. 2. 
splendida, W. Smith, Syn., 1853, t. 26, f. 233. 
Ralfs in Pritch. Inf., 1861, p. 771. 
Meridion radians, Ag., Sys. Alg., 1824, p. 3 (in part). 
Gomphonema flahellatum, Kiitz., Linnea, 1833, p. 571. 
„ argentescens, Kiitz., Lin,, 1833, p. 571. 
This is decidedly the most common and best known of the 
two species or varieties of which the genus is composed^ and 
is generally noticed as the larger plant. Agardh, in 1824, 
in the earliest notice of it, under the name of Meridion 
radians J describes it as ^^frustulis lineari-cuneatis/^ and in 
the 'Conspectus/ in 1830, as ^'Plantula magnifica.^^ Dr. 
Greville, in the 'Scot. Cryp. Fl.,^ vol v. No. 289 (in describing 
Exillaria flabellata), and in Hooker's 'Brit. El.,^ p. 408, 
states the frustules to be linear-wedge-shaped, and stems 
from one third to half an inch in height. Captain Carmichael, 
in the MSS. ' Algse Appinensis.^ in Sir W. Hooker's library 
at Kew, describes the frustules as " linearis-cuneatis,^^ and 
calls it the " largest and most beautiful of the tribe/^ Pro- 
fessor Harvey, in the ' Brit. Algse,' appears simply to follow 
Dr. Greville^s description in Hooker's ' Brit. FL' Ehrenberg, 
in the ' Infusion sthierchen,' states the frustules to be 
'^lineari-cuneatis truncatis," and Kiitzing, in the 'Bacillarien,' 
says, "bacillis gracilibus lineari-cuneatis.'' Ealfs, in the 
last edition of Pritchard's ' Infusoria,' evidently follows Pro- 
fessor Smith in naming the species, but in describing his L. 
splendida, he states it to " differ from the other species of the 
genus by its longer and narrower frustules. I, at one time, 
thought that Agardh's L. argentescens of the ' Consp. Crit. 
Diat,' p. 4], was identical with Dr. Greville's splendida, as 
he states the valves to have " frustula cuneata but, at the 
same time, he says, "the plant is three to six lines in height," 
and from authentic specimens I have had kindly sent me by 
Dr. Greville, I find it is certainly the same as fiabellata, and 
it w^as probably only separated, as suggested by Mr. Ralfs, for 
