NOTEWORTHY ADDITIONS TO THE 

 MYCOLOGICAL HERBARIUM 



Four Interesting Species of Moulds 



In the study of moulds at the New York Botanical Garden 

 during the month of July, 1909, the following interesting species 

 were found and placed in the herbarium. 



Mucor rufescens Fischer. This species was found in con- 

 siderable quantity on elephant's dung. It is very distinct and 

 easily recognized by the flaccid sporangiophores forming a net- 

 work over the substratum, and by the orange-colored substance 

 in the columella and upper part of the sporangiophore. 



Mucor circinelloides van Tieghem. This species is very 

 variable in its mode of branching, but the circinellate branches are 

 usually evident. It was cultivated on bread. 



Pilobolus longipes van Tieghem. The elongated, worm-like 

 swelling at the base of the sporangiophore is very characteristic 

 of this species. Found on horse dung. 



Circinella umbellata van Tieghem & Le Monnier. This 

 beautiful species is generally found with Thamnidium elegans 

 Link. It was collected on dung of jaguar. 



David R. Sumstine. 



A New Boletus from Tropical America 

 Boleti are exceedingly scarce in tropical America, and, indeed, 

 in all tropical countries. This is true also of certain genera oil 

 large, fleshy agarics, such as Russula and Lactaria. The ex- 

 tremes of moisture and dryness may be too great for these plants, 

 which are essentially terrestrial, as opposed to many tropical 

 forms of agarics that occur on dead wood; they may lack the 

 association and substratum connected with certain trees of tem- 

 perate regions, such as oaks and chestnuts ; they may have been 

 partially or totally cut off from these regions by certain barriers in 

 the course of geographical distribution ; or they may be temperate 



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