BASIDIOMYCETES FROM JUAN FERNANDEZ 467 



Xerotus Fk. 



X. latcritius B. et C. 



Syn. A'. Archcri Bekk. et X. Jicrten'i Mont. 

 Masatierra: Valle Colonial, Quebr. Seca, 20. 12. 1916. 



Polyporus iMich. 



P. (Ganoderma) australis Fr. 



Masatierra: Valle Colonial, Quebr. Gutierrez, 7. 12. 16. El Yunque, 18. 12. 

 1919, Quebr. Damajuana 30. 12. 1916. 



Masafuera: Quebr. Blindado, 19. 2. 1917. 



P. (Fomes) resinosus (SCHR.) 



S}'n. /•. marginatus PerS. et P. nugulatus SCH^FF. 



Masafuera: Playa Ancha, Varadero, 12. 3. 1917. 



P. (Fomes) senex Nees et Mont. 



Masatierra: Villagra, Quebr. Choza, 4. i. 1917. 



Is probably the genuine species as it agrees well with a small fragment 

 of the original specimen in Bresadola's herbarium. It is easy to break and 

 cut and seems not to be so tough as specimens from other countries referred 

 to »senex». The sterile part is thin (about 1—2 mm.), while the porose part 

 is 2—3 cm thick and consists of numerous layers, each of which is only about 

 one mm. thick. These layers are scarcely traceable on sections but reveal 

 their existence by partly loosening from each other when the specimen is 

 broken irregularly so as to form stairs or parallel lines on the sectional sur- 

 face when viewed in oblique direction. The color of hymenium is a trifle 

 paler than in the specimens otherwise referred to »senex» in the herbaria. 

 The hymenial spines are dark, thick-walled, about 12 — 35 x 6 — 10 ^. Spores 

 (not seen in connection with basidia) subglobose, fulvous, 4 — 5 ji, or 4—6 X 

 3-5 — 5 IJ- 



P. (Fomes) senex Nees et MoNT. var. torosa. 



Masafuera: Quebr. Chozas, 3. 3. 1917. 



I am not quite sure that this specimen is referable to P. sejicx. It agrees 

 with it in having a thin steril part and a many times thicker porose part (12 

 mm. thick) and also with regard to hymenial hyphae (2 — 3 [x thick), spines and 

 spores. It differs in having a thicker margin (5 — 8 mm. thick) and broad and 

 rather thick concentric wales which are covered with a very short and dense 

 felt of typhaceous color, while the upper surface of the specimen which I have 

 interpreted as typical »senex» is glabrous and blackish brown with very narrow 

 and partly indistinct concentric wales. The difference ma3' of course be due 



