195 



structure of thehymenium in this genus resembles closely that of a 

 young Phallus. 



The only two British species. 



Genus 57. Rhizopogon.* Tul. 

 Peridium continuous or cracked, adhering to creeping branched 

 fibres which traverse its surface ; cells distinct, at first empty ; 

 spores smooth, oblong-elliptic, minute. 



1. Khizopogon rubescens, Tul., I.e., p. 89, t. ii., f. 1, and t. xi,, 

 f. 4. First met with in England in woods near Portbury, Somerset. 

 It becomes very foetid when old, a character at variance with 

 Tulasne's description, in which he says it is nearly scentless, and 

 although his plant agi-ees with ours in other respects, yet the 

 diiference in so marked a character causes one to doubt of the 

 identity. Tulasne, however, named our plant on inspection of 

 specimens. The strong odour in our plant indicates R. graveolena, 

 Vitt., whose other characters accord sufl&ciently with it. 



The only British species. 



Genus 58. HYMENOGASTER.t Tul. 

 Peridium fleshy or thin, running down into an absorbing base ; 

 cavities at first empty, radiating or irregular ; trama composed 

 of elongated cells, not of byssoid flocci, and therefore not easily 

 separable. 



1. Hymenogaster muticus, B. and Br. Stapleton Grove, near 

 Bristol. Ann. of Nat. Hist, ser. ii., 2, p. 267. Tul., l.c., p. 65, 

 t X., fig. 7. 



2. H. luteus, Vitt. Tul., 1. c, p. 65, t. i, fig. 3. Common in 

 plantations. 



3. H. decorus, Tul., l.c. p. 67, t. x., fig. 9. Common in 

 plantations. 



4. H. vulgaris, Tul., l.c., p. 67, t. x., fig. 13. Woods near 

 Bristol. 



5. H. citriuus, Vitt. Tul, l.c., p. 69, t. i., fig. 1, and t. x., fig. 

 3. Common in plantations. 



* Rhizopogon, from riza, a root, and pogon, a beard, 

 t Hymenogaster, from umen, a membrane, and gaster, a cavity. 



