280 ANALES DE LA SOCIEDAD CIENTÍFICA ARGENTINA 



Obs. Pileus maximus, suborbiculatus (33-35 cent, diam,), appla- 

 nato-convexus^ centro depressus, irregnlariter et obsolete sub- 

 concentrice ac subradiatim undulatus, utrinque ad médium fis- 

 sus (an piliiduo pleuroti dorso connati?), suberoso-flaccidus, e 

 tabacino fulvellus non v. tíx hinc inde subnitens, glaber, sed 

 tactu asperulo-velutinus (corio instar), margine subrecto, sub- 

 tumidulo, acutiuscule rotundato, fuscescente (!), integro v. re- 

 pando-undulatus, cute snbcrustacea, tenuissima, carne arete 

 adnata, subfragili; contextus suberoso-floccosus (1 cent, crass.), 

 compactiusculus, fulvescenti-umbrinus, sub cute pallidior; hy- 

 menium planum, compactum, durum primo albescens dein pal- 

 lide fulvescens, non stratosum, margine sterili, crustáceo, fu- 

 scescente, sublatiusculo (2 mllm. lat.) limitatum; poricompacti, 

 intus umbrini, pulvere discolori destituti, ad stipitem longiu- 



, sculi (1 cent, long.), marginem versus gradatim abbreviato-eva- 

 nescentes, gráciles, ore rotundato minimo (100-120 diam.), dis- 

 sepimentis subtenuibus (35-40 crass.), acie obtusiusculis. Stipes 

 centralis, longiusculus et crassinsculus (10 cent. long. — 3 cent, 

 diam.), durus, lignosus, inaequabilis et undulatus, laevis, gla- 

 ber, cute crustácea, laccata, nitentissima e castaneo purpura- 

 scente arete vestitus. 



Species pulcberrima et distinctissima ; specimina guaranitica non- 

 nihil a descriptione citata recedunt, sed speclminibus Lorent- 

 zianis subtypicis perfecto respondent. 



32. PoLYPORUS (Pleurotus) parvimarginatus Speg. (n. sp.) 



Diag. Carnoso-lentus, parvulus; pileus horizontalis, postice sub- 

 truncatus v. cuneatus (2-2,5 cent. diam. — 1,5-2 cent. lat. ant.- 

 post.), in stipite brevi, gracili (5-7 mllm. — 1,5-2 mllm.), hori- 

 zontali,fuscescenti-subatro, tenuissime olivaceo-pruinuloso pro- 

 ductus, tennis, subcarnoso-lentus, subflaccidulus, carne albo- 

 subfuscescente (0,5 mllm. crass.), margine acutissimo, recto, 

 etiam postice ad originem stipitis prominiüo, glaber, laevis v. vix 

 subradiatim rugulosus, castaneo-fuscus; hymenium tumidulum, 

 e poris brevissimis (1-1,2 mllm. long.), densissime stipatis, ore 

 rotundato, minutissimo (120-180 diam.), dissepimentis tcnuis- 

 simis, albo-pallescentibus (in sieco fulvescentibus) compo- 

 situm, margine sterili, membranaceo-rigidulo, acuto limita- 

 tum, deorsum in stipite subdecurrens sed determínate promi- 

 nulum. 



