276 4NALES DE LA SOCIEDAD CIENTÍFICA ARGENTINA 



disco convexulo, centro plano v. depressulo, glabra, atra, opaca, 

 laevia v. minutissime (vix sub lente valida) rugulosa v. sparse 

 papillulosa; cortex crassiusculus (0,2-0,4 mllm, crass.), durus, 

 corneocarbonaceus, in fracturisresinose nitens, diu persistens, vix 

 centro disciapicalis per aetatem obliteratus ac evanescens, a sub 

 stantia interna stromatis distinctissimus; substantia interna 

 totum corticis stromatis cavum implectens, homogénea, fusco- 

 atra v. coffeicolor, obsolete fibrosula, in fracturis sericeo-nitens ; 

 perithecia sub disco supero in cavitate lenticulare dense 

 aggregata, verticalia cylindraceo-elliptica (1-2 rallm. long.x 

 0,3-0,4 mllm. diam.), membranaceo-coriacella, per aetatem fra- 

 gilia ac friabilia, ostiolo minuto (vix evoluto), disci stromatis 

 superficiem vix attingente imperspicuoque donata: asci obovato- 

 clavati (p. sp. 32-40x12-15), longissime pedicellati, sed.facile 

 decidui, parapliysibus densissimis guttulatis v. septulatis, gra- 

 nulosis, obscure chlorinis (2-3,5 crass.) obvallati, octospori; 

 sporae distichae v. polystichae, inordinatae, ellipticae, utrinque 

 obtusissime rotundatae (10-12x5-6), e latere non compressae, 

 rectae, intense ex oliváceo cblorinae. 



Hab. Ad truncos vetustos emortuos Cürii aurantii in sylvis prope 

 Guarapí, per annis 1879-81 (sub num. 2775-3417). 



Obs. Species pulcherrima a genere certe satis desciscens ac facile 

 in novo genere constituenda inter Hypoxylum et Camilleam. 



207. Kretzschmaria guaranitica Speg. (n. sp.) 



Dtag. Stroma solitarium, extus atrum, intus albo-farctum, gla- 

 bmm; stipes deorsum insititius rectus v. curvus, irregulariter 

 incrassato-scruposus, glaber v. vix pruinulosus, sursum rectus, 

 erectus gracilis (20-30 mllm. Iong.x0,5-1 mllm. crass.), teres, 

 apicem versus gradatim leniterque attenuatus, fusco-ater, lon- 

 gitudinaliter minute denseque granulosus, glaber, vértice abrup- 

 te in clavula expansus; clavula plus minusve regulariter hemis- 

 phaerico-lenticularis (5-8 mllm. diam. — 1 mllm. crass.) mar- 

 gine acute rotundata, inferné sterilis, laevis, superno convexula 

 fertilis, densiuscule mammilloso-papillata, atra; peritbecia mo- 

 uosticha, globoso-subdepressa (400-450 diam.), extus atra, cras- 

 siuscula, coriacella, e stromate parum prominula, ostiolo um- 

 bonato-papillato, ápice saepius minute umbilicato ac zona 

 fulvella, vix perspicua, cincto donata; asci cylindracei, sursum 

 obtusissime rotundati, crassissime tunicati, obturaculo ma- 



