430 
Trypethelium, Spr. Trib. 2. Limborin^, 
Ophthalmidium, Esch. Fr. 
Bathelium, Afz. Gyrophora, Ach. 
‘^Astrothelium, Eschw. Gyrostomum, Fr. 
Trib. 4. VERRUCARiNiE, Limboria, Ach. 
Fr. Urceolaria, Ach. 
Verrucaria, Pers. Thelotrema, Ach. 
Pyrenula, Ach. Anthrocarpum, Mey. 
Stigmatidium, Mey. Trib. 3. Glyphide^, 
Ocellularia, Meyer. Fr. 
Nematora, F^e. Chiodecton, Ach. 
Phyllocharis, F4e. Glyphis, Ach. 
Craspedon, F^e. Asterica, Meyer. 
Melanophthalmum, 
Fde. 
Sarcographa, Meyer, 
Conioloma, Flbrke. 
Thromhium, Wallr. Trib. 4. Graphide^, 
Strigula, Fr. 
? Racopl(sa, Fr. 
Pyrenastrum, Eschw. 
Parmentaria, F4e. 
Trichar ia, Fde. 
Pyrenothea, Fr. 
Ord. 3. Idiothalami, 
Fr. 
Trib. 1. Pyxine^, Fr. 
Umbilicaria, Hoifm. 
Pyxine, Fr. 
Fr. 
Graphis, Ach. 
Opegrapha, Pers. 
Allographa, Chev. 
Oxystoma, Eschw. 
Leiogramma, Eschw. 
Leioreuma, Eschw. 
Medusula, Eschw. 
Lecanactis, Eschw. 
Hysterina, Ach. 
Oxystoma, Eschw. 
Scaphis, Eschw. 
Sclerophyton, Eschw. 
Arthonia, Eschw. 
Ustalia, Fr. 
Pyrochroa, Eschw. 
Coniangium, Fr. 
Diorygma, Eschw. 
Fissurina, F^e. 
Ord.4. CONIOTHALAMI, 
Fr. 
Coniocybe, Ach. 
Calicium, Pers. 
Trachylia, Fr. 
? Coniocarpon, DC. 
Ord. 5. Byssace.®, 
Rhizomorpha, Roth. 
Thamnomyces, Ehren. 
Synalissa, Fr. 
Coenocarpus, Reb. 
Melidium, Eschw. 
Phycomyces, Kunze. 
Ascophora, Schw. 
Periconia, Tode. 
Lichina, Ag. 
Cora, Fr. 
Cilicia, Fr. 
Ccenogonium, Ehrenb. 
Thermutis, Fr. 
Gausapia, Fr. 
Dictyonema, Ag. 
Dichonema, Fr. 
Hypochnus, Ehrenb. 
Colletosporium, Lk. 
Racodium, Lk. 
Tophora, Fr. 
Trichosporum, Fr. 
Amphitrichura, Nees. 
Byssus, L. 
Nematogonium,Desm. 
Spurious Genera. 
Isidium, Ach. 
Variolaria, Pers. 
Arthonia, Ach. 
Naevia, Fr. 
Incillaria, Fr. 
Arthronaria, Fr. 
Fumago, Pers. 
Mycinema, Fr. 
Lepraria, L. 
Protonema, Ag. 
Herpotrichum, Fr. 
Plegmatium, Fr. 
Lanosa, Fr. 
Hypha, Pers. 
Order CCXCI. ALG.^:, 1 
or IThe Sea-weed Tribe. 
ALGACE.E.J 
ALGiB, Juss. Gen. 5. (1788); Roth. Catalecta Botanica (1797) ; DC. FI. Fr. 2. 2. (1815); 
Agardh Synops. Alg. (1817) ; Species Alg. (1821-1828); Syst. Alg. (1824^; Gre- 
ville Alg. Brit. (1830) ; Hooker, Brit. FI. vol. 2. pt. 1. (1833). — Phycei, Acharius 
(1807?). — Thalassiophyta, Lamouroux Ann. Mus. 20. (1812); Gaillon in Diet, 
des Sc. 53. 350. (1828). — Hydrophyta, Lyngb. Tentam. (1819). — ARTHRoniEiE, 
Bory in Diet. Class. 1. 591. (1822). — Hydronemate^, A7ee5 in Nov. Act. Nat. Cur. 
11.509. (1823); Ann. des Sc. 13. 439. (1828). — Chaodine^, Conferv.® and Cera- 
MiA-Rmm., Bory in Diet. Class. 3. and 4. (1823). — Chmtopkouoideje, Greville FI. 
Edin. 321. (1824). — Hydrophyc.®, Fries Syst. Orb. Veg. 320. (1825). — Nema- 
zoAiRES, Gaillon in Ann. Sc. Ser. 2. 1. 44. (1834). 
Essential Character. — Leafless flowerless plants, with no distinct axis of vegetation, 
growing in water, frequently having an animal motion, and consisting either of simple 
vesicles lying in mucus, or of articulated filaments, or of lobed fronds, formed of uniform 
cellular tissue. Reproductive matter either altogether wanting, or contained in the joints of 
the filaments, or deposited in thecse of various form, size, and position, caused by dilata- 
tions of the substance of the frond. Sporules with no proper integument, in germination 
elongating in two opposite directions. 
Affinities. Whatever ingenuity may be employed in determining the 
relative degree of dignity in the vegetable creation between Fungi, Lichens, 
and Algae, it seems to me that the conclusion which is constantly arrived at 
is, that Algae are absolutely distinguishable from the two others only by their 
living in water, and that, except for the influence which that medium exercises 
on them, they would be identical with Lichens on the one hand, and with 
Fungi on the other. Those who wish to make the order a special study will 
do well to take the excellent Species Algamm of Agardh for their guide, and 
