128 NEW YORK STATE MUSEUM 



Betula lenta (carpinifolia) (sweet birch) 



"^^6 A crimson red erineum, turning to ochreous, in straight 

 beady Hnes, midway between the ribs or closely bordering the ribs, 

 or both, on upper side of leaf. Trichomes capitate. 



Schweinitz '34, no. 2809 (Erineum line o la) Pa. 



Specimens in the State Herbarium from the Helderbergs (Pro- 

 fessor Peck) labeled E . 1 i n e o 1 u m . There seems to be no 

 doubt of the identification; de Schweinitz's description is full and 

 precise. Also from Gravel pond, Grafton, Rensselaer co. N.Y. 



37 A rosy pink erineum in large patches on the upper side of 

 the leaf. 



Garman '92, no. 17 N.H. 



Jarvis '07, p.63, fifth sp. Ont. 



Possibly a spreading form of the preceding. 



Betula lutea (yellow birch) 



38 A bud deformation, crowded and irregular, often in bunches 

 of large size. 



Hagen '85, no. 37 - Mass. 



Jarvis '07, p. 59, seventh sp., pi. A, fig. 6 Ont. 



I' 

 Betula nigra (red birch) 



39 Erineum betulinum Link no. 26. 



Schweinitz '34, no. 2804 Pa. 



Placed under Erineum proper, with capitate trichomes, and simi- 

 larly under Grumaria by Per soon '22: no. 17, who describes it as 

 " efTusum planiusculum primo subgrumosum albidum, purpureum 

 et roseum, dein rubiginosum obscurum. Cresc. in utraque pagina 

 fol. Betulae albae, sed magis in superiore, praesertim si colore est 

 rubro. Hue pertinent ut varietates E. betulinum roseum et pur- 

 pureum auctorum." 



40 Erineum roseum Link no. 25, *' f requens." 



Schweinitz '34, no. 2803 Pa., Car. 



Persoon considered this a color variety of the preceding, as will 

 be seen from the above quotation. Loew, Verb, der k. k. zool.-bot. 

 Ges. in Wien 1885: 455, 461 describes E. roseum Schultz as 

 forming small irregular, mostly elongated, crummy patches of a 

 blood-red color upon the upper surface of the leaves (of B . alba, 

 h u m i 1 i s and pubescens); in the early summer carmine red. 



