602 MURRILL : POLYPORACEAE OF NORTH AMERICA 



ment of the question at least until I can study our American form 

 in the field. 



Sesia Adans. Fam. 2: 10. 1763 



Serda Adans. Fam. 2 : 11. 1763. 



Gloeophyllum Karst. Hattsv. 2: 79. 1882. 



Lenzitina Karst. Finlands Basidsv. 337. 1889. 



The genus Sesia was founded upon Vaillant's figures of S. hir- 

 suta (Schaeff.) drawn from specimens collected on the timbers of 

 a boat at St. Cloud, Paris. The genus Serda is based upon a re- 

 supinate form of the same species collected at the same time and 

 place and figured in the same work. In establishing the genus 

 GloeopJiyllum, Karsten overlooked Adanson's genera already 

 founded and later even overlooks or purposely changes his own 

 generic name to Lenzitina. All four names above mentioned are 

 strictly synonymous, being founded on the same type species. 

 Karsten listed three other European species, L. abictina (Bull.), 

 L. ciiuiamomca (Fr.) and L. septentrionalis Karst., as congeners of 

 the type. 



The species of this genus have white spores, brown substance 

 and normally daedaleoid or lamelloid tubes. Abnormal poroid 

 forms quite frequently occur. All the species are found on decay- 

 ing wood, and, as is often the case, some grow only on the wood 

 of conifers, while others are confined to deciduous wood. 5". hir- 

 suta is abundant in the northern hemisphere on coniferous wood 

 of all kinds, .S. Bcrkclcyi is rare on coniferous wood in tropical 

 America ; ^S. pallidofulva is abundant in North America on wood 

 of deciduous trees, while its place is taken in tropical America by 

 ^S". striata. The species are all of medium size, easily distin- 

 guished by striking characters. 



Synopsis of the North American species 



1. Context ferruginous to chestnut. 2. 

 Context avellaneous to umber. 3. 



2. Surface hirsute. I. S. hirsuta. 

 Surface finely tomentose or glabrous. 2. 6'. Berkeleyi. 



3. Furrows broad, a millimeter or more in width, pileus very thin, 



multizonate. 3. S. striata. 



Furrows narrow, only a half of a millimeter in width, pileus ' 



rather thick, usually devoid of zones. 4. S. pallidofulva. 



