PRELIMINARY NOTES ON SOME NEW SPECIES 

 OF AGARICS. 



By GEO. F. ATKINSON. 



(Read April 19, 1918.) 



Amanita brunnescens nov. sp. Gregaria vel dispergens, 8-15 cm. 

 alta : pileo convexo dein expanse, fuligineo-brunneo, 4-9 cm. lato, 

 subumbonato, in centre obscuriore, ad marginem pallidiore et fre- 

 quenter brunneo virgato vel macnlato, e calyptra volvae floccoso 

 squamoso, squamis albis vel palHdo-ochraceis, interdum margine 

 pilei albo, rare pileo albo, matura margine pilei interdum striatulo : 

 lamellis leni'ter attigentibus, albis : sporis quaternis, albis, globosis, 

 8-10 /a: stipite albo, abrupte bulboso, floccoso-squamuloso, 4-10 mm. 

 crasso : annulo amplo, membraneo, superiore, albo vel pallide albo, 

 demum murino : bulbo stipitis 2-3 cm. crasso, margine bulbi limbo 

 volvse curto, acuto prsedito. Stipite, bulbo, et interdum carne pilei, 

 tactu brunnescens. 



This is one of the most common species of Amanita in the eastern 

 United States, and I have observed it for many years. It is usually 

 interpreted as a dark brown form of Amanita phalloides. For a 

 number of years I have regarded it as a distinct species. Typical 

 Amanita phalloides which I have collected in France has been com- 

 pared and confirms this opinion. The spores of typical Am. phal- 

 loides are subglobose to oboval or subellipsoid, and bruises do not 

 change to a reddish brown color. The American plant being a dif- 

 ferent species may account for different results, obtained in chemical 

 analyses, from those reported for the typical Amanita phalloides of 

 Europe. 



No. 242'/'j, type, C. U. Herb., ground, woods, w'est of Cayuga 

 Lake, near Ithaca, N. Y. July 30, 1917. Leva B. Walker collector. 



Amanita pachysperma nov. sp. Gregaria vel dispergens, 4-5 cm. 

 alta: pileo campanulato dein convexo, umbonato, 1.5-2 cm. lato, 

 cinereo, e calyptra volvse dense et minute squamuloso, margine ad 

 umbonem striato, carne tenue : lamellis albis, ellipsoideo-ventricosis, 

 basidiis abrupte clavatis, 35-45 X 12-15 /a • sporis binis, subellipsoideo- 

 obovalibus, 11-15 X S-io^u,, sed 20X8, 18X12, 12X8, 11X8, 

 10 X 7, uniguttulatis : stipite albo, leniter bulboso, floccoso-squam- 

 uloso, 3-4 mm. crasso : annulo membraneo, albo, superiore et per- 

 sistente : limbo volv?e libero, persistente. 



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