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Overholts: Mycological Notes for 1919 139 



tree on the campus of the Pennsylvania State College. A laven- 

 der or purplish tint has been noted on the teeth this season. 



The genus Mucronella is characterized by short awl-shaped 

 teeth that arise directly from the substratum without the inter- 

 vention of a subiculum. It thus approaches some of the small 

 Clavaf'ias in habit, and some would include the genus in the 

 Clavariaceae. In some species, as the present one, the teeth 

 are not separate but are united several in a fascicle, approaching 

 the form of a diminutive Hydnum erinaceum or related species. 



Mr. Lloyd has recently summarized 7 our knowledge of the 

 taxonomy of the genus. He lists five species, four of which 

 have been reported from the United States. Two of these are 

 now known to occur in Pennsylvania. The plants are extremely 

 rare, however, and no other account of the species of the United 

 States has been published. I take this opportunity, therefore, to 

 present a photograph and a few remarks concerning the species. 



The genus as originally founded was said to have one-spored 

 basidia. I have examined my material carefully but no spores 

 or sterigmata were seen, though young basidia were abundant. 

 The following descriptive notes are appended : 



Plants white, drying gray, composed of few or several awl- 

 like teeth, 2-4 mm. long, united by their bases into small clusters 

 2-4 mm. broad and 2-5 mm. long ; spores not obtained ; cystidia 

 none. 



On bark of living elm trees. October. 



6. Paxillus corrugatus Atk. 



A collection of this rare plant was made at Shingletown Gap, 

 Center County, Pa., August 16, 1919, on the bark and wood of a 

 fallen Pinus rigida. The species is easily recognized by the very 

 strong odor and the corrugated gills that are near ochraceous buff 

 (Ridgway) in color. The odor is very characteristic and unlike 

 that of any other fungus. It has persisted until the present time 

 in a Kentucky collection preserved in the writer's herbarium since 

 1909, when it was collected by Dr. Bruce Fink. Parts of the 

 present collection were very largely resupinate. 



7 Mycological Notes No. 39, pp. 531-533. 1915. 



