fungí guaranitici 273 



Diag. Euhypoxylon; stromata majuscula (5-10 mllm. diam.) soli- 

 taria v. aggregata, saepeque confluentia, hemispliaerico-pulvi- 

 nata (5-6 mllm. crass.), ambitu rotundato-coarctatula, non v. 

 vix repandula, obsoletissime ruguloso-papillosa, primo sordide 

 griseo-fusca (pruina detersili obducta), dein (nuda) atra, intus 

 fusco-grisea v. plumbeo-atra radiatim fibrosa, non v. vix sericeo- 

 nitentia; perithecia periphaerica monosticha, dense constipata 

 elliptica V. subobovata, e mutua pressione saepe angulosa ( 700- 

 800 long. X 400-450 diam.) coriacella, in stromatis superficie 

 non V. vix. prominula sed obsolete discoideo-applanata, ostiolo 

 vix lente valida perspicuo, non exertulo . ac saepe hysterioideo 

 ornata; asci mox difluentes non visi; sporae ellipticae v. navi- 

 culares, utrinque obtuse acutatae (42-14x6-6,5), opace fuli- 

 gineae. 



Hab. Ad corticem duriorem arborum dejectorum putrescentium 

 in uliginosis nemorosis prope Guarapi, Jul. 1881 (sub num. 

 2763-71). 



ubs. Species pulchra H. hypomilto M.ntg. diíñnis; cum H. solido 

 B. et C. certe cognata, sed descriptione nimis manca. 



201. HyPOXYLON SÜBNIGRICANS Speg. (n. sp.) 



Diag. Euhypoxylon: Stroma ligno denúdate nigrificatoque late 

 ambiens (5-15 cent.), applanato- pulvinatum (0,5-1 mllm. 

 crass.), ambitu repando-subdeterminatum, non eífusum, non v. 

 leniter undulatum, dense regulariterque granulato-mammillo- 

 sum, primo pulvere fusco vestitum, dein nudum, atvum saepe- 

 que subnitens: perithecia e globoso-ellipsoidea (300-350 diam.), 

 densissime constipata, parce prominula, ostiolo minutissimo, 

 umbonato-papillulato donata, carbonacea, atra; asci et para- 

 physes mox ñuxiles; sporae elliptico-naviculares, utrinque acu- 

 tato-rotundatae (10-11x4.-4, 5), opace fuligineae. 



Hab. Ad ramos decorticatos putrescentes arborum in dumetis prope 

 Guarapi, Nov. 1881 (sub num. 3424). 



202. Hypoxylon mbaiense Speg. (u. sp.). 



Diag. Euhypoxylon; stromata matrice squarrulosule nigrefacta 

 insidentia, sparsa v. pauci aggregata, oligocarpa, rotundata v. 

 elongata, párvula (1-3 mllm. x0,5-l mllm.), pulvinata (0,5 mllm. 

 <jrass.), margine obtusato-determinata, ruguloso-scrupulosa, 

 subpruinuloso-aspera, primo fuscescenti-atra, deiu extus intus- 



ANAL. SOC. CIENT. ARG. T. XVIII. 18 



