LICHENES. U3 



angulata, in singulis squatnis aul solitaria aut plura enata ac tum in fine contigua, in eis 

 immersa et aliquando paulum emersa et (une tballo aut ipso perithecio circumdata : eorum 

 discus aut flavidus aut obscure coloratus, lœvigatus vel rugis gyrose varieve decussatus. 

 Perithecium vel incoloratum "vel rarius interne leviter coloratum, ex hyphis e medullaortis, 

 horizontalibus et Iateraliter verticalibus atque ibi brevius articulatis, simplicibus aut ramosis 

 constitutum ; gonidia sub eo vigentia. In apotheciis compositis, perithecia secundaria, para- 

 physes ad rugas efformandas superantia, ex hyphis e primario ortis et ejus hyphis similibus 

 constantia. Paraphyses in apice coloratae, capitataeant truncatae, aliquando cuticula hyalina 

 et continua coopertae, saepe iongissimee, parum crassae, semper articulatae, saepe ramosœ ramis 

 interdum anastomosantibus et iodo plerumque cœruleœ. Thecœ aut parvœ et paucas, aut 

 magnœetnumerosissimas sporas continentes, in apice clavatœ el inbasi attenuatœaul caudatœ; 

 massa sporalis sursum vel breviter apiculata, vel paulum depressa. Sporœ hyalinae simplices, 

 vulgo parvulœ, oblonga?, rarius globosae, inunica specie octonae, in alia 24-50 me, in caeteris 

 pluriescentenae. Spermog-ouia in thallo inclusa, magna et osliolo parvo indicata ; sterig- 

 mata brevia, recta, nec articulata, nec ramosa ; spermatia parvula et oblonga. 



Spécies circiter 99 cognitaj, quarum 55 infra descriptœ, vulgo saxicolœ, interdum terrestres, 

 rarissime lignicolœ, terras frigidas altosque montes prœaçnantes, sed passim in subalpina el in 

 planitiem descendentes atque ibi in regionibus calidis aliquando vigentes. 



Seclio !. — Archacarospoùa Th. Fr. 

 Lichenogr. scand., 1871, p. 208. 



Apothecia simplifia seu eorum discus Ixvigatus. 

 A. — Tallus flavidus. 



1. — HVPH r. CORTICIS SUPERIORIS SIMPLICES AIT PARCE RAMOS.K. 



487. Acarospora hilaris Th. Fr. Lichenogr. scand. (1871), p. 209 ; Lecanora hilaris 

 Du tour, Nyl. Lich. Scand. (1801), p. 173 ; Parmelîa hilaris Duf. in herb. Ach'arii, teste 

 Th. Fr., /oc. citât. 



Thallus intense flavens, tenuis, opacus, rosulam formans supra saxum 15 mill. latam, ex 

 areolis 0,5-0,7 mill. latis, discretis vel contiguis, angulatis, planis et lœvibus compositam, in 

 peripheria radians radiis parvis, longitudine inœqualibus, planis et in apice integris ant le\ iter 

 crenulatis. Cortex superior 50-60 [a latus et granulis flavo virentibus, hydrate kalico disso- 

 lutis, repletus; in eo hyphœ fastigiatœ, i-6 aerassa\ arcte conglutinatœ, constricte articulatae 

 articulis sphœricis vel parum oblongis cum sepimentis crassis et luminc 3-5 a lato, parce 

 aut non ramosœ, sed in partibus juvenilibus multum ramosae atque in zona externa, 10 p. lata, 

 protoplasmate sœpe orbatœ. Gonidia pallide viridia, protococcoidea, 8-20 a la ta, membrana 

 incrassata, aut dispersa, autparvos glomerulos sub cortice formantia ; intereahyphaeseptatœ 

 et magnos meatus offerentes, Hyphœ medullares nudœ, varie directœ et sicut in cortice 

 septatœ. Cortices lateralis et inferior 10-15 y. lali et e\ hyphis verticalibus constantes. 

 xVpothccia 0,1-0,3 mill. lata, unicum vel duo in quavis areola enata immers'aque ac disco 

 obscure rufo ornata. In perithecio incolorato subtus 30-40 el Iateraliter 20 p, lato, hyphœ 

 horizontales, ramosœ, articulatae et stricte coadunatœ atque Iateraliter verticales et vix ab 

 hyphis cortici s distinct»; sub eo gonidia vigentia. Paraphyses hyalinae, in apice corpuscula 

 viridi flava ferentes et cuticula 10-20 a lata, hyalina et continua obtectae, 100 (i altae, \ a 

 crassœ, rectœet flexuosœ, arcte cohérentes, articulatae articulis paulum longiscum seplis sat 

 Nouvelles Archives ru- Muséum, 5 e série. — I, 1909. 15 



