278 



INTRODUCTION TO CllYPTOGAMIC BOTANY. 



Fig. 64. 



a. Fulcra and ascus, with sporidia of Uncinula spiralis, Berk, and 

 Curt. 



h. Perithecium, with its numerous fulci*^ and ascus, of Eri/siphe densa, 

 Berk, and Curt. 



c. Ditto of MicrosphcFra sernitosta, Berk, and Curt. 



d. Fulcra of Uncinula adunca^ Lev. 



e. Ditto of Microsphcpra Mottgeotii, L6v. 



All more or less magnified. 



From specimens communicated from the United States, by Rev. M. A. 



Curtis. 



3. SPHiERIACEI, Ft. 



Perithecia free or immersed in a woody or variously consti- 

 tuted stroma, opening by a distinct punctiform or sliort linear 

 aperture. Asci mostly springing from the walls, persistent. 



284'. We come now to an immense group of Fungi, com- 

 prising at tlie least a thousand good species, and possibly 

 double that number. As at present limited, the species are 

 doubtless multiplied beyond all necessity; but an attentive 

 study will at once prove that they must be very numerous. 

 The old genus SphcBTia (Fig. Q5) is now broken up into a large 

 number of genera, but the distinctions are difficidt, and by no 



