356 Transactions. — Botany. 



30. Verrucaria [Pyre aula) arthoniza, n. sp. 



Thallus ochraceus v. pallido-ochraceus tenuis areolatus, verrucis apo- 

 thecioruin ruinutis (basi latit. circ. 0-5 mm.) hernisphaericis v. convexis. 

 Apotbecia orbicularia primitus immersa, excipulo proprio atro crasso integro 

 mox supra denudato — turn arfcbonoidea et margine tballode tumidulo — 

 paraphysibus distiuctis. Sporae in ascis cylindraceis, ellipsoidese normaliter 

 loculos 4 transversos lentiformes offerentes, hyalinas taudem fuscescentes, 

 longit. 0-015, crassit. 0-006 mm. 



Ad arborum cortices. 



31. Verrucaria (Acrocordia) subatomaria, n. sp. 



Tballus obscurus v. nullus. Matrix non mutatur. Apotbecia minu- 

 tissima orbicularia (diam. 0-2 mm.) in matrice subimmersa, excipulo proprio 

 integro atro-fusco, ostiolo minuto nonnibil biante, bymenio pallido-fusco 

 parapbysibus reticulato-capillaribus. Sporae in ascis elongato-pyriformibus 

 oblonga3 l-septata3 incolores byalina3, longit. 0-017, crassit. 0-007 mm. 



Ad cortices. 



Obs. — V. subatomaria, Nyl., in litt. Dr. Ny lander's name is adopted. It 

 will be seen, however, that the entire proper excipulurn and hyaline colour- 

 less spores separate this species so widely from V. atomaria, DC, as to 

 render the prefix of " sub " somewhat misleading. 



32. Verrucaria (Segestria) metabletica, n. sp. 



Thallus sordide cinereus tenuis continuus (matrice reticulato-rugosa) 

 granulas gonimas virides in nodulis magnis continens. Apotbecia made- 

 facta aduata atra minuta (diam. 0-2 mm.) hemisphaarica, excipulo dimidiato, 

 ostiolo pallido minutissimo v. nullo, paraphysibus distinctis. Sporas in 

 ascis cylindraceis fusiformes incolores 3-7-septatae, longit. 0-02, crassit. 

 0-005 mm. 



Ad arborum cortices. 



Obs. — Var. a. Thallus albescens, sporas 7-cellula3, cellulis medio 

 majoribus. 



33. Verrucaria (Thelidium) suffusa, n. sp. 



Tballus cinereus tenuis effusus a linea fusca limitatus. Apotbecia 

 minuta (diam. 0-3 mm.) hemisphaerica thallo leviter obtecta, excipulo atro 

 crasso dimidiato, ostiolo suffuso tandem prominulo nonnibil ambitu dealbato, 

 hymenio matrice imposito, paraphysibus adglutinatis rectis oleoso-grumosis. 

 Spor» in ascis elongato-clavatis oblongas 3-septata3 incolores, 'longit. 0-028, 

 crassit 0-008 mm. 



Ad arborum cortices. 



34. Verrucaria {Thelidium) calcarea, n. sp. 

 Thallus atro-fuscus tenuissimus irregulariter effusus v. nullus. Apo- 

 tbecia minuta (diam. 0-25 mm.) innato-sessilia hemisphasrica v. convexa, 



