BLACK AND WHITE PLATES 



FACING PAGE 



I. The ruby-throated humming-birds know these 

 lichens and so use them in decorating their 

 nests as to make it difficult to distinguish them 



from lichen-covered knot-holes .... 34 



II. The Pitted Cetraria, Cetraria lacunosa, Ach. . 80 



III. Old Man's Beard, Usnea barbaia, variety Florida 82 



IV. Old Man's Beard, Usnea longissima ... 84 

 V. Parmelia pbysodes, (L.) Ach., variety vittata. . 86 



VI. Parmelia perlaia, (L.) Ach 90 



VII. Spotted Lungwort, Sticta pulmonaria, (L.) Ach. . 96 



VIII. StereocaulonPascbale, L 98 



IX. The Fringed Cladonia, Cladonia fimbriaia, (L.) Fr. 102 



X. Batfania trilobata, L. 106 



XI. Acute-leaved Peat-moss, Sphagnum acutifolium, 



Ehrh. 124 



XII. The Spread-leaved Peat-moss, Sphagnum squar- 



rosum, (Pers.) 128 



XIII. The Broom-moss, Dicranum scoparium, Hedw. . 154 



X I V. Whip-fork Moss young, Dicranum flagellare, Hedw. 1 70 

 Whip-fork Moss old, Dicranum flagellare, Hedw. 170 



Ditricbum pallidum 170 



Ortbotricbum 170 



XV. The Curly-leaved Ulota, Ulota crispa, Mohr, and 186 



Lichen, Parmelia saxatilis, (L.) Fr. . . .186 



XVI. Top Moss, Pbyscomitrium turbinatum, Muell. ined. 210 



The Pale Funaria, Funaria flavicans, Michx. . 210 



The Water-measuring Cord-moss, Funaria bygro- 



metrica, Sibth 210 



XVII. Weber a nutans, Hedw 218 



Weber a albicans, Schimp. L c 218 



XVIII. The Rose Bryum, Bryum roseum, Schreb. . . 224 

 XIX. Mnium punctatum, variety elatum, Bruch & 



Schimp 232 



