OP ARTS AND SCIENCES. 177 



exliibente. Sporte 2-3"* in thecis, ellipsoidece, simplices, incolores, 

 0,060-80"""- longis, 0,040-50"""- crassis. 



Kock.-s, San Dietro, Califoinia, Dr. J. G. Cooper ; and received, also, 

 in excellent condition from other collectors (Herb. WiUey). 



Pertusaria euglypta, sp. nov. : thallo cartilagineo insculpto- 

 rimoso glauco-cinerascente ; apotheciis sub-globosis (latit. 1-1,8 mm.) 

 pleiotlialamis, circnm ostiola punctiformia nigra depressis. Sjiorae '3- 6"", 

 ellipsoidea;, simplices, incolores, longit. 0,(192-138™"'-, crassit 0,040-60""°-. 



Granitic rocks, Cape of Good Hope, C. Wright. Comparable with 

 states of/*, communis, Auct. {pertusa (L.) Ach.), but diifcring in the 

 spores, and in its elegantly sculptured crust, which reminds one of a 

 cuneiform inscription. 



Pkrtusaria albinea, sp. nov. : thallo tenui rimuloso-areolato 

 lacteo linei^ nigris decussato ; apotheciis depresso-hemisphajiicis depla- 

 natisque pleiotlialamis (latit. 0,5-0,8 mm.) ostiolis minimis punctiformi- 

 bus nigris. Sporte octonte, ellipsoideae, simplices, incolores, longit. 

 0,043-58"""-, crassit. 0,023-40"'"'-. 



On bark, Galapagos Islands, Rev. T. Hill (Hassler exp. 1872). Dis- 

 tinguishable from P. leioplaca bv habit, and the smalliiess of its parts. 



Thelotrema Californiccji, sp. nov. : thallo subtartareo verru- 

 culoso pallide ochroleuco ; apotheciis lecanoroideis (longit. 0,3-0,7 mm.) 

 adnatis sub-planis, excipulo exteriori margine obtuso integerrimo thai- 

 lino discura nigrum velo margine concolore perforato subvestitum in- 

 cludente, demum flexuoso-irregnlaribus stellatis lirellatisqiie. Sporte 

 octon^e, ex ellipsoideo dactyloideae, 4-8-loculares, loculis integris, fuscag, 

 longit. 0,020-30'""-, crassit. 0,005-8"'™-. 



On bark, San Diego, California, Dr. E. Palmer (Herb. AVilley). 

 The whole of the interior of the disk is black, without distinguishable 

 proper margin, and the general aspect is that of Lecanora ; but the 

 spores, and the crustaceous veil, whicli is more or less exhibited, appear 

 to associate the lichen with Thelotrema, tliough I know of no species to 

 compare it with. Apothecia now suggesting those of Chiodecton xphce- 

 rale. There is no reaction of the hymeneal gelatine with ioiline; nor 

 of the thalline tissues with liquor potassas or hypochlorite of lime. 



PiLOPHORUs acicularis (Ach.) Tuckerm. Gen. p. 146, f. Hallii ; 

 apotheciis elongatis (longit. 2-4 mm., crassit. 0,5 mm. — 1 mm.) pistil- 

 liformibus. — On rocks. Cascade Mountains, Oregon, E. Hall. The 

 apothecia of Pilophorus pass from a globular, often depressed figure, as 

 in f. Fibula, into a slightly conical one, like an elevated skull-cap 

 (jiD.og;), as in the original f. acicularis. And the last is lengthened in 

 the present so as to resemble a pestle. As comjiaied with the other 



VOL. XII. (n. S. IV.) 12 



