'8 



IIYDXEAE Fr 



138. IIydnum flavum Brk. Sacc, 1. c. f. 456. 



Ilab. Ad trniicos ramos caudicesque putrescentes in sylvis 

 prope Apiahy, per ann. 1881-88 (sine n. et sub n. 2889). 



Obs. Species pulcherrima a genere Hydno facillime sepa- 

 randa ac melius Ilymenochaeti adscribenda, sat varia- 

 bilis; formae nobiliores haec 3 sequentes : 



aj Pilei coriaceo-membranacei, in sicco rigiduli, dimidiato- 

 tlabellati (5-20"' dm.) subcucullato-convexuli, postice 

 cuneati non marginati laevissimi; contextus sordidealbo- 

 pallescens compactus tenuis (0,5'" crass.); hymenium e 

 pallescente lutescens aculeis cylindraceo-conoidei (150- 

 200 X 50-60 /^), laxiusculis pallide subferrugineis apice 

 sfacelatis atque pallidioribus vestitum. 



b) Pilei tenues coriacei, rigidi in sicco, ex orbiculari reni- 

 formes subcucullato-convexuli (^40-50'" dm.) postice 

 emarginati, stipite brevissimo vix evoluto peltato-dilatato 

 (5-10'" It.) adfixi, margine integri cristula tenuissima 

 acuta strictissima vix perspicua aucti, fulvo-rufescentes, 

 unicolores, glaberrimi laevissimi ; contextus albus com- 

 pactus subtenuis (1'" crs.); hymenium ex albo pallescens 

 aculeis obscure ferrugineis, cylindraceo-conoideis (200- 

 250 X 40-45 y) subconfertiusculis apice integris acutissi- 

 mis vestitum. 



c) Pilei tenuiter membranacei, e rigidulo flacciduli, dimi- 

 diato-suborbiculares, cucullato-subgaleati (90-100'" dm. 

 trans. X 60-80'" dm. ant.-post.) postice profunde cor- 

 dato-sinuati marginati stipite parvulo brevissimo tuber- 

 cuiiformi subdorsali adfixi, ambitu integri v. vix subre- 

 panduli, e lutescente sordide pallideque fulvescentes, li- 

 turis radiantibus fuscescentibus ramulosis saepe anasto- 



