OP ARTS AND SCIENCES. 181 



Lectpea psephota, sp. nov. : thallo areolato albo, areolis mitiutis 

 tumidiilis discretis, hypothallo nigro ; apotheciis perruiuutis (latit. 

 0,2-0,4 mm.) areolis plerumqne immixtis e concavo planis margine 

 tenui incurvo persistente, saepe angulo.so-difformibus. Hypothecium 

 nigrum. Sporje in tliecis ventricosis octonse, elli[)Soideas, simplices, 

 incolores, longit. 0,012-20™'"-, crassit. 0,007-10"""-, paraphysibiis con- 

 cretis. — On granite rocks, shores of Straits of Magellan, accompanying 

 (in the specimen) BuelUa petrcea b. vulgaris and B. geographica, Rev. 

 T. Hill (Hassler exp. 1872). The lichen itself not a little resembles 

 B. stellulata (Tayl.). 



Lecidea tessellina, sp. nov. : thallo rimoso-areolato glaucescente 

 (cinerascente vel dein sublutescente) areolis planis Isevigatisque (rarius 

 turgidis) hypothallo atro subinde marginatis ; apotheciis minutis (latit. 

 0,3-07 mm.) areolis immersis e concavo mox planis nudis, margine 

 tenui acuto subpersistente, demum confluenti-difformibus. Hypothe- 

 cium incolor. Sporse octonfe, ellipsoideae, simplices, incolores, longit. 

 0,009-14°""-, crassit. 0,005-7"""-, para|)hysibus coalitis. — Common on 

 •various rocks throughout the Appalachian range, and observed also 

 ■westward, in Kansas and Missouri, by E. Htdl. A well-marked lichen, 

 which I long tried to consider a lecideoid Lecanora (§ Aspicilin), with 

 which group it accords, moreover, in its spermogones and staff-shaped 

 spermatia on subsim[)le sterigmas. The rtniction of tlie thallus with K. 

 is yellow (becoming in time reddish), and that of the hymeneal gelatine 

 with iodine, blue. 



Lecidea cyrtidia, sp. nov. : thallo effuso tenuissimo leproso oli- 

 vaceo-virente ; apotheciis perminutis (latit. 0,2-0,4 mm.) appressis 

 mox conv^exis immarginatisque. Hypotliecinm nigrum. Sporie 6-8"® 

 ovoideo-ellipsoideis, sim|)lices nebulosiE vel pseudo-biloculares, incolores, 

 longit. 0,006-10""-, crassit. 0.0025-45""'-, paraphysibus coalilis. — On 

 sandstone, IMissouri, B. Hall ; Pebbles, Quincy, Mass., H. Willey. A 

 very humble, but yet marked, lichen. 



APPEXDIX. 



Kerguet.en Lichens. A brief notice of lichens collected in Ker- 

 guelen's Land by Dr. Kidder, Naturalist of the United Statt-s Transit 

 Expedition in 1874-75, as of a few others gathered previously in the 

 same island by Dr. Hooker, and now preserved in the late Dr. Thomas 

 Taylor's herbarium (Herb. Bost. Soc. Nat. Hist.), was prepared and 

 published by the present writer in the Bulletin of the Toney Bot. 

 Club, Vol. VI. No. 10 (Oct. 1875). In the November following, a 

 note on " New Lichens from Kerguelea Land," joUected by the Rev. 



