856 Transactions.— Botany. 
90. Verrucaria (Pyrenula) arthoniza, n. sp. 
Thallus ochraceus v. pallido-ochraceus tenuis areolatus, verrucis apo- 
theciorum minutis (basi latit. cire. 0°5 mm.) hemisphericis v. convexis. 
Apothecia orbicularia primitus immersa, excipulo proprio atro crasso integro 
mox supra denudato—tum arthonoidea et margine thallode tumidulo— 
paraphysibus distinctis. Spore in ascis cylindraceis, ellipsoidew normaliter 
loculos 4 transversos lentiformes offerentes, hyaline tandem fuscescentes, 
longit. 0:015, crassit. 0:006 mm. 
Ad arborum cortices, 
91. Verrucaria (Acrocordia) subatomaria, n. sp. 
Thallus obscurus v. nullus. Matrix non mutatur. Apothecia minu- 
tissima orbicularia (diam. 0-2 mm.) in matrice subimmersa, exeipulo proprio 
integro atro-fusco, ostiolo minuto nonnihil hiante, hymenio pallido-fusco 
paraphysibus reticulato-capillaribus. Spore in ascis elongato-pyriformibus 
oblonge 1-septate incolores hyaline, longit. 0-017, crassit. 0:007 mm. 
Ad cortices, 
Obs.— V. subatomaria, Nyl., in litt. Dr. Nylander’s name is adopted. It 
will be seen, however, that the entire proper excipulum and hyaline colour- 
less spores separate this species so widely from V. atomaria, DO., as to 
render the prefix of ** sub " somewhat misleading. 
82. Verrucaria (Segestria) metabletica, n. sp. 
Thallus sordide cinereus tenuis continuus (matrice reticulato-rugosa) — 
granulas gonimas virides in nodulis magnis continens. Apothecia made- 
facta adnata atra minuta (diam. 0-2 mm.) hemispherica, excipulo dimidiato, 
ostiolo pallido minutissimo y. nullo, paraphysibus distinetis. Spore in 
ascis cylindraceis fusiformes incolores 3-7-septate, longit. 0:02, crassit. 
0-005 mm. 
Ad arborum cortices. y 
Obs.—Var. a. Thallus albescens, spore 7-cellule, cellulis medio 
majoribus. 
83. Verrucaria (Thelidium) suffusa, n. sp. 
Thallus cinereus tenuis effusus a linea fusca limitatus. Apothecia 
minuta (diam. 0-3 mm.) hemispherica thallo leviter obtecta, excipulo atro 
crasso dimidiato, ostiolo suffuso tandem prominulo nonnihil ambitu dealbato, 
hymenio matrice imposito, paraphysibus adglutinatis rectis oleoso-grumosis. 
Spore in ascis elongato-clavatis oblong 8-septate incolores, longit. 0:028, 
crassit 0:008 mm. 
Ad arborum cortices. 
94. Verrucaria (Thelidium) calearea, n. sp, 
Thallus atro-fuscus tenuissimus irregulariter effusus v. nullus. Apo- 
thecia minuta (diam. 0-95 mm.) innato-sessilia hemispherica v. convexa, 
