28 NATURAL HISTORY OF KERGUELEN ISLAND. 



called "handsomest of the vegetable products of this the island of Des- 

 olation". But this last, though received by Nylander (Neuropogon Tay- 

 lori, Nyl. Syn. 1, p. 273), is hardly well discriminated from the older 

 species by the description of either author ; and I cannot separate any 

 of the numerous specimens before me from others got, during the same 

 voyage, at the Falkland Islands (Herb. Hook.), which Taylor and Ny- 

 lander appear to have referred to V. melaxantha. 



2. Pannaria Taylori, Hp. nov. — Thallo foliaceo cartilagineo appresso 

 luteo-fulvo, lobis apice rotundatis crenatis iucisisque, subtus nigris 

 hypothallo obsolescente; apotheciis (demum plusquam j2 millim. latis) 

 lecanorinis sessilibus, margine crasso ruguloso, disco piano fuscescente. 

 Sporse ellipsoidese, simplices, iucolores, 0,016-21'"°> long. 0,009-11™™ 

 crass. — Rocks, Hooker (Herb. Taylor). — Medullary layer of compact, 

 elongated cells. Collogouidia 0,002-5""* in diameter, solitary or in 

 chains of 2-5. The specimen is rather more than an inch across. It 

 occurs with Placodium elegans, but wrapped apart, in Dr. Taylor's col- 

 lection. 



3. Pannaria glaucella, sp. nov. — Thallo foliaceo cartilagineo arete 

 appresso glauco-cinerascente, subtus pallido hypothallo obsolete, lobis 

 radiantibus subintegris; apotheciis (0™™. OOG-S latis) lecanorinis adnatis, 

 margine integro demisso, disco dein convexo fusco-nigro. Sporse imma- 

 turse. — Rocks. — Specimens scarcely half an inch across. Elongated cells 

 of medullary layer compact. Collogonidia 0,004-9™™ in diameter, in 

 chains often of 4-10. 



4. Placodium elegans, i^mL D. C. — Rocks, Roolcer (Herb. Tayl.). — 

 Spores 0,010-17™™ long and 0,007-9™™ thick. Called Xecawora wwrorww 

 by Dr. Taylor (Herb.), but not reckoned in his Lichenes Autarct. I. c. 

 It is perhaps better referable as above. 



5. Placodium bicolor, sp. nov. — Thallo crustaceoadnato rimoso- 

 areolato aurantiaco, cephalodio centrali (0-10™™. lat.) pluribusve de- 

 pressis radiatim rimosis, concoloribus onusto, ambitu lobato; apotheciis 

 (2-3™™. lat.) sessilibus, disco piano nigrofusco, margine tenui demisso 

 subintegro. Sporae in thecis uniserialiter octonae, ellipsoideae, polari- 

 biloculares, 0,020-30™™ lat,, 0,012-20™™ crass., paraphysibus capillari- 

 bus. — Rocks. — Collogonidia of the cephalodia 0,006-9™™ in diameter,, 

 reddish, solitary or in short chains. The name and much of the char- 

 acter of Lecanora dichora, Tayl., I. c, suggests the present lichen ; but 

 the infertile specimen, called (notwithstanding its orange color) Leca- 

 nora yelida by Taylor (Herb.), appears to me to belong here. Thallus 

 at length two inches wide. 



