EXPLANATION OF PLATES 



The plates accompanying this work consist of colored drawings made 

 from living plants, photographs, and drawings of spores and other microscopic 

 characters. All spore drawings are made with the aid of the camera lucida 

 and are drawn to a common scale. The reduction is also approximately 

 equal so that the proportionate sizes are kept throughout. Other microscopic 

 characters such as the hairs from the apothecia are also drawn with the aid 

 of the camera lucida but occasionally it became necessary to use a lower 

 magnification. If desired, the exact magnification can be determined by com- 

 paring reproductions with sizes indicated in descriptions. An especial effort 

 has been made to keep drawings of spores approximately proportionate 

 throughout the work. 



Since the plates are distributed through the body of the work, instead of 

 being bunched at the end, as a matter of convenience the page opposite which 

 the plate appears is placed in parenthesis directly after the plate number. 



In order to save space and bring the various characters together, a 

 combination of photographs and drawings has been used. Where not other- 

 wise indicated, the photographs of apothecia and ascophores are approximately 

 natural size, although they may not indicate the maximum size which the 

 apothecia may attain. 



Frontispiece 



Phillipsia Chardoniana. Vertical view of two plants showing the ex- 

 panded apothecia, about natural size. Drawn and colored from life by Mr. 

 Mario Brau of the Department of Agriculture of Porto Rico and the plate 

 furnished by the courtesy of that Department. 



Plate 1 (p. 48) 



Upper figure (1). Pseudoplectania vogesiaca. Three apothecia, about 

 natural size. Also drawing of a portion of an ascus with spores; one of the 

 branching and hooked paraphyses; and a portion of one of the hairs from the 

 outside of the apothecium. 



Lower figure (2). P seudoplectania nigrella. Several apothecia, about 

 natural size, showing the habitat among Sphagnum moss. At the left, drawing 

 of a portion of an ascus with spores and a paraphysis. Below, two of the 

 coiled and twisted hairs from the outside of the apothecia. 



Plate 2 (p. 52) 



Figure 1. Boiidiera areolata. Portion of an ascus with spores and a tip 

 of one of the much thickened paraphyses. Drawn with the aid of the 

 camera lucida from material collected in Maine by Dr. Roland Thaxter and 

 compared with authentic material collected in Europe. The spores are 

 marked with long spines or interrupted reticulations. 



Figure 2. Boudiera echinulata. Drawn from material collected in 

 Iowa and originally described as Sphaerosoma echinulatum by the author. 



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