214 
Enchylium offine Massal. 
Mem. lich. pag. 94 fig. 113. 
. Enchylium Rubbianum Massal. 
Geneac. pag. 24 n. 73. — Symm. pag. 57. 
Obs. Ob encatogonidiorum insignium praesentiam, ob formam 
apothecioram (apotheciis Acorosporae macrosporae fere simillimam) 
et ob tballum ecorticatam species maxime spectabilis, fortase novum 
genus. 
Religuum est tantummodo ut novum genus Arnoldia, quod in 
honorem Nob. Dom. Arnold, tam bene de Lichenologia germanica 
‚meriti, ita appellare placitum est, deseribam. Ecce characteres: 
Arnoldia nov. gen. 
 , Apotbecia ex mesothallo oriunda, punctiformia omnino immerss, 
primum clausa, dein papillaeformia in thalli pagina inferiore pustu- 
larım ad instar protuberantia, tandem plus minusve conico-truncata, 
vixque aperta suburceolata, excipulo thallode recepta. Lamina pro- 
ligera lichenina instructa gelatinosa crassiuscula, hypothecio agoni- 
mico imposita. Asci elavati erebri 8-spori, paraphysibus crassius- 
culis obvallati; sporae ovoideo-ellipticae v. fusiformes diaphanae 
unilocalares, — Thallus peltatus umbilicato-adfixus, monophyllus in- 
teger gyroso-plicatus, utringue leviter rugulosus, rigidus, madefactus 
turgescens tenerrimus, epidermide anista undique einctus, e tribus 
stratis distinctis constitutus, epilhallinicus nempe e gonidiis conie- 
gonidiisque flavo-viridulis mucilagine colorata obvolutis; nesbthalini- 
cus crassus ex ormogonidiis sc. gonidiis moniliformibus ac filamen- 
tis ramosis anastomosantibus diaphanis mucilagine chromatica einctis; 
‚hypothallinieus e gonidiis eroceis mucilagine colorata obvallafis 
compositus. Spermatocalia monoica heteroicia immersa punctiformiä, 
minutissima, erismata filifformia ramosa, tromodoblastia ovoidea Ar- 
ciminutissima. 
Observatio, Differt potissimum a generibus Omphalarie el 
Thyrea ob gonidiorum moniliformium praesentiam. 
. Arnoldia cyathodes Massal. in litt. ad Arnold. 12. Jan. 1856. 
Thallus coriaceus 4—6-lin. latus, simplieiuscnlus tandem gyro® 
plieatus integerrimus, supra einereo - pruinosus, subtus atro -fulvus, 
madefactus utringue olivaceus: apothecia plerumgue pruina albo- 
einerea tecta; asei apice attenuato-rotundati, sporae elliptico - fusl- 
formes utrinque attenuato-subulatae diam. long. mm. 0,0122 vel. 0160, 
transv. mm. 0,0061 usque ad 0090. 
Syn. Omphalaria Girardi D. M. nonn. p. p- 
= 
