336 



BOTANICAL GAZETTE 



[APRIL 



published, 36 this catalogue advances the region to the position of having one of 

 the very few well known floras in the state. The present list includes 40 species 

 of pteridophytes and 479 species of spermatophytes. One happy improvement 

 in the present publication is the ecological definition of the habitat, replacing 

 such time-honored but meaningless phrases as "hillsides," "glades," "woods," 

 and "cool dry woods." — Geo. D. Fuller. 



lake 



These beds in Colorado have been 



finely 



insects. Knowlton 37 has now published a review of the plant material on 

 deposit in the U.S. National Museum. Over 100 plants are presented, and 

 among them 18 new species are described, chiefly woody dicotyledons. Two 

 new genera are proposed; Palaeopotamogeton (Potamogetonaceae) and Floris- 

 sant ia (Solanaceae). The list of types of fossil plants from Florissant in the 

 U.S. National Museum includes the names of 121 species. — J. M. C. 



Mushroom fairy rings. — The occurrence of well developed "fairy rings" 

 formed by a large mushroom known as Tricholoma praemagmim in the dry 

 grassland of the open mountain parks of Colorado has been described by 

 Ramaley. 3 * They have been observed in various localities, but all between 

 6000 and 9000 ft. in altitude. The rings vary much in size, the smallest 

 observed being 3.3 m. across, and seen to increase in diameter at a rate of 

 about 1 dm. per year. One of the interesting characteristics of the fungus is 

 its distinctly xerophytic habit. — Geo. D. Fuller. 



Aerating system. — Hunter 3 * has studied the structure of various air 

 chambers in plants of Vicia Faba and has found spaces of various sorts in the 

 testa of the seed, the cotyledons, the stem, the leaves, and the root. The study 

 adds to our knowledge of the aerating system as developed in seed plants, even 

 if it rather fails to justify the author's conclusion that the system is "elabo- 

 rately adjusted in order to insure an efficient gaseous exchange for each living 

 cell no matter where its position may be in the plant tissues." — Geo. D. 



Fuller. 



# Cooper, W. S., A list of mosses collected upon Isle Royale, Lake Superior. 

 Bryologist 16:3-8. 1913. 



*7 Knowltox, F. H., A review of the fossil plants in the U.S. National Museum 

 from the Florissant lake beds at Florissant, Colorado, with descriptions of new species 

 and list of type specimens. Proc. U.S. Nat. Mus. 51:241-297. pis. 12-27. 1916. 



* Ramaley, Francis, Mushroom fairy rings of Tricholoma praemagnum. Tor- 

 reya 16:193-199. 1916. 



*> Hunter, C, The aerating system of Vicia Faba. Ann. Botany 29:627-634- 



19*5 





