SPORES HYALINE. SETAE PRESENT. 



FOMES DENSUS. There occurs rarely in the United States and Europe'a 

 thick, heavy form of Fomes conchatus, differing only in not being thin. Fomes 

 conchatus is usually about a centimeter thick. This form is very rare and I have 

 but three collections. 



SPECIMENS. United States, O. M. Oleson; France, F. Fautrey; Portugal, Moeller. 



ILLUSTRATIONS. Quelet, t. 17, fig. 5, is a crude cartoon intended to represent this thick 

 form of Fomes conchatus. The shape is about right, but the color more resembles a carrot. 



FOMES LAMAENSIS. Pileus applanate, with a smooth, hard 

 brown or black crust. Context bright orange yellow (close to Raw 

 Sienna), contrasting with the dark crust. Tissue of two kinds of 

 hyphae, having large, thick, darker colored setae like hyphae im- 

 bedded in the usual type. (See fig. 600, page 261.) Pores minute, 

 darker than the context. Setae numerous, rather thick. Spores (?) 

 hyaline, globose, 5 mic. 



This is an abundant plant in the East and a number of specimens 

 are at Leiden, collected years ago in Java. They were referred to 

 Fomes igniarius. Cooke got it from Tonkin years ago and referred it 

 for Bresadola to Fomes marmoratus (sic.). Recently the Philippine 

 collectors have found it in quantity, and Mr. Murrill described it as 

 a "new species" twice on the same page (Fomes lamaensis and Fomes 

 Williamsii). A year later he referred it to Fomes endothius, to which 

 it has no affinity. I am not sure it is a Fomes, at least I have not 

 noted true Fomes forms. Nor am I sure of spores. I have never 

 found them. Murrill records them as hyaline ; Bresadola indicates that 

 they are colored. The hy menial cells are hyaline and I think also 

 the spores. The bright color of the context is a marked feature of 

 this plant to the eye, and the "structure" is also unusual under the 

 lens. Fomes melanodermus (in Section 76) is a very similar plant, 

 but has abundant colored spores. 



Compare Williamsii. 



FOMES RHEICOLOR. Pileus applanate, with a dark, smooth 

 crust. Context bright rhei yellow (brighter than yellow ochre Ridg- 

 way), hard, woody. Pores minute, concolorous or a shade darker. 

 Setae rare. Spores not found. 



This is based on a specimen received from Leon Castillon, Ar- 

 gentine. To the eye it closely resembles Fomes lamaensis, and we 

 at first thought it was the same thing. However, we do not find the 

 two forms of context hyphae that are so characteristic of Fomes 

 lamaensis, of the East. Nor do we know Fomes lamaensis in the 

 American tropics. 



B. Context Dark Brown. 



FOMES IGNIARIUS. Pileus ungulate (often resupinate or 

 subresupinate), with a hard, black, usually rimose crust. Context 

 dark brown (Argus brown), hard, woody. Pores minute, with con- 

 colorous tissue, and brown mouths. Pore layers 1-2 mic. thick. Hy- 



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