SECTION LIGNOSUS. 



This section embraces stipitate species, that are subligneous but not perennial. 

 In texture they are similar to the preceding. They are never soft and fleshy. 

 The hyphae and spores are pale, in which characters they differ from the two 

 preceding sections. Most of them are included in Fomes in Saccardo, but none 

 of them are Fomes according to the definition of the genus that Sacoardo gives. 



8. PLANTS WHICH FORM A SCLEROTIUM. CONTEXT 

 PALE OR ISABELLINE. SPORES PROBABLY WHITE. 



SACER (Fig. 420). Pileus thin, with minutely velutinate, 

 zonate surface. Color pale to dark brown. Stipe mesopodal, dull, 

 pale surface, proceeding from an underground sclerotium. Context 

 and pores isabelline. Pores medium small with thin walls. Polyporus 

 sacer is represented in the museums by a number of collections, all 

 from Africa. It first reached Fries and was of much interest from 

 the fact of having a sclerotium. The name "sacer" refers to some 

 superstition that the negroes are said to attach to it. 



RHINOCEROTIS. Pileus glabrous, rugulose zoned, at first thin, 

 then thicker and indurated. Stipe mesopodal with a dull surface, not 

 "laccate" as erroneously described, proceeding from a sclerotium two 

 or three inches in diameter. Context pale. Pores minute. This plant 

 is so close to Polyporus sacer that our photograph (Fig. 420) could 

 well represent either. It is quite different however in its minute pores, 

 and the tissue of old specimens becomes more thick, hard, and woody. 

 It was known for many years only from the imperfect type from Malay, 

 but recently a fine specimen was sent to Kew from Perak, and Pro- 

 fessor Petch has made one collection in Ceylon. 



9. PILEI UNILATERAL AND SUPERIMPOSED. CONTEXT 



PALE. 



SUPERPOSITUS (Fig. 421). Pileus unilateral and superim- 

 posed, arranged one above the other or on one side of stem, like shelves. 

 Surface pale isabelline, smooth. Context pale isabelline. Hyphae pale. 

 Spores not found, doubtless white. This species is most curious in 

 the peculiar arrangement of the pilei. It is known from three collec- 

 tions, all at Kew. First it reached Berkeley from "New England," 

 Australia (not "Amer. Bor." as Saccardo incorrectly compiles it) then 

 Cooke got a collection from Perak and one from New Guinea. These 

 three from widely remote localities are all I have seen of this most 

 peculiar species. 



10. STIPE MESOPODAL OR PLEUROPODAL. CONTEXT 



WHITE OR PALE. SPORES WHITE. 



CORRUGIS (Fig. 423). Pileus with pleuropodal (rarely meso- 

 podal) stipe. Surface of pileus and stipe minutely velvety-brown with 



