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PART III. THE CLASSIFICATION OF PLANTS. 



limited to the upper part (e.g. Typhula) ; the basidium has sometimes only 

 two sterigmata (e.g. Pistillaria, Typhula). 



Fam. 3. Thelephorcce. In the lowest forms there is no compound goiiidiophore 

 but merely a hymenial layer (e.g. Exobasidium) ; in others the gonidiophore is 

 gymnocarpous, forming an incrustation on the substratum, and bearing the 

 hymenium on its upper surface (<>.g. Coniophora, Hypochnus, Corticium) ; in the 

 high forms (e.g. Thelephora, Stereum, Cyphella, Craterellus), the gonidiophore, 

 at various form, branched or unbranched, bears the hymenial layer on its 

 under surface ; the hymenophore is smooth, with projections or pits. 



Fam. 4. Hydnece. In the lower forms the compound gonidiophore forms an 

 incrustation on the substratum, with the hymenium on the upper surface (e.g. 

 Odontia, Grandinia) ; in the higher forms (e.g. Sistotrema, species of Hydnum) ; 

 the hymenium is borne on the under surface of the gonidiophore, which is, in 



PIG. 221. A Part of compound gonidiophore of Clavaria flava (nat. size). B Compound 

 gonidiophore of Hydnum inibncatum : st the spiny projections of the hymenophore; s 

 scales on upper surface of pileus (| nat. size). C Longitudinal section of the compound 

 gonidiophore of a Polyporus : p tubes of the hymenophore, lined by the hymenium, 

 appearing on the under surface as pores. 



some cases, differentiated into stipe and pileus; in all cases the hymenophore 

 bears a number of spinous projections over which the hymenium extends (Fig. 

 221 B), and is gymnocarpous. 



Fam. 5. Polyporece. The compound gonidiophore may be a flattened expan- 

 sion with the hymenium on the upper surface (e.g. Porothelium) ; or semi- 

 circular, and attached laterally, with the hymenium on the under surface (e.g. 

 Merulius, Daedalea, species of Polyporus, Fig. 221 C) ; or differentiated into 

 stipe and pileus with the hymenium on the under surface (e.g. Boletus) ; the 

 hymenophore is indented with pits or tubes, which are lined by the hymenium. 

 The gonidiophore is generally gymnocarpous, but there is a velum partiale in 

 some forms (e.g. Boletus versipeliis, viscidus, floccopus, Polyporus volvatus). 

 The Dry Eot of timber is caused by members of this family. 



Fam. 6. Agaricince. The compound gonidiophore is a pileus, with or without 



