278 ANALES DE LA SOCIEDAD CIENTÍFICA ARGENTINA 



glaucescens, margine recto, acutiusculo, sublobato v. repandulp- 

 undulato; hymenium subcrassiiisculum (3-4 mllm. crass.), sub- 

 ceraceo-carnosum, albescenti-rufum (in sicco, an álbum in vivo?), 

 spongiosum, e laminulis tenuibus dense strigoseque intertextis, 

 eroso-laceris constitutum, cum carne pilei confluentibus in sti- 

 pite non v. parcissime foraminulatim decarrentibus. 



Hab. Ad truncos vetustos cariosos in sylvis virgineis prope Para- 

 guarU Mart. 1883 (sub num. 3913). 



Obs. Genus singulare distiuctissimum, habitu Agarici v. Polypori 

 pleuroti cujusdam, hymenio nuUo alio comparando, basin Lyco- 

 perdi hyemalis Bull. in mente revocante, donatum; specimen 

 unicum, quod adest, ob senectutem nonnihil incompletum, et 

 basidia sporasque diu frustra quaesivi. An tantum monstruo- 

 sitas? 



28. POLYPORUS (Mesopus) guaraniticüs Speg.(n. sp.) 



Diag. Carnosus, truncigenus ; pileus cyatlioideo-infundibuliformis 

 (7-14 cent, diam.) tenuiter lento-caruosus (2-3 mllm. crass.), 

 laevis, glaber, pallide sordideque testaceus (in sicco), radiatim 

 tenuissime densiusoule ac irregulariter virgatus, margine mem- 

 branáceo, applanato, acuto plus minusve integro v. irregulariter 

 lobato V. SLiblaciniato, lobis repando-undulatis, crenulatis v. 

 denticulato-fissis; tubuli minuti, pileo concolores v. pallidiores,- 

 ore rotundato-angulato (150-180 diam.), in lobis marginalibus 

 brevissimi saepe vix impressi, centrales longiores (1-2 mllm. 

 long.) ac non rarius subobliqui et in stipite irregulariter laci- 

 niatim decurrentes ; stipes erectus, curtus, crassus (2-3 cent, 

 long. — 5-9 mllm. crass.), e basi non v. vix noduloso-adnata gra- 

 datim leniterque incrassatus atque ápice in pileo expansus, 

 farctus, glaberrimus, laevis, pileo concolor. 



Hab. Ad truncos arborum in sylvis Santa Barbara prope Villa 

 Rica, Jan. 1882 (sub n. 3365). 



Obs. Species eximia in juventute pileo tenui carnosulo-membra- 

 naceo, integro v. vix repandulo, hymenio ad marginem latiuscule 

 obsoleto donata; bymeniumper omnes aetates in vivo et in sicco 

 continuum nec rimuloso-diffractum. 



29. PoLYPORUs (Mesopus) paraguayensis Speg. (n. sp.) 



Diag. Carnosus, truncigenus; pileus explanato-infundibularis 

 (8-14 cent, diam.), carnoso-membranaceus (1-2 mllm. crass.), 



