April 24, 1914] 



SCIENCE 



621 



also showed infection in a more or less serious 

 degree. This rust is not roestelia-like, a8 in 

 the case of the more common apple rust and 

 other rusts whose telial stage is a Gymno- 

 sporangium. The incense cedar which bears 

 the telial stage is very common in southern 

 Oregon, being found on the floor of the Rogue 

 Eiver Valley at an altitude of 1,400 feet. The 

 proximity of incense cedar trees to apple and 

 pear orchards is therefore of considerable 

 economic importance. 



The hosts upon which the secia of this rust 

 have been found are: 



Malus malus (L.) Britton (apple). 



Malus floribunda Sieb. (several varieties) 

 (flowering crab). 



Pyrus communis L. (pear). 



Pyriis chinensis (Oriental pear). 



Pyrus sitchensis (Eoem.) Piper (mountain 

 ash) . 



Malus diversifolia (Bong.) Roem. (native 

 crab apple). 



Gydonia vulgaris (L.) Pers. (quince). 



Cydonia japonica (Thumb.) Pers. (Japan 

 quince) . 



Amelanchier florida Lindl. (serviceberry). 



Cratwgus douglasii Lindl. (thornapple or 



Culture records and final proof will be 

 given in a detailed paper which will be pub- 

 lished in the near future. This preliminary 

 paper is given simply as a statement as to 

 what has been found. 



P. J. O'Gaha 

 Pathological Laboratoey, 

 Medfoed, Oregon, 

 September 1, 1913 



a possible mutant in the bellwort (oakesu 

 sessilirolu.) which prevents seed 

 formation 

 The sessile-leaved bellwort {OaTcesia sessili- 

 folia) is used in many elementary classes in 

 botany as a convenient type to illustrate the 

 Lily family. The normal pistil with a single 

 detached stamen is shown in Fig. 1, magnified 

 three diameters. There are three stigmas ter- 

 minating styles which are free at their extrem- 

 ities. In class material collected late in the 



spring of 1912, flowers were discovered with 

 pistils pf the form shown in Fig. 2. The pistil 

 is shorter and thicker than in normal flowers 

 but the essential abnormality consists in the 

 transformation of the three stigmas into func- 



FlG. 1. 



tional stamens, each with a pair of pollen sacs. 

 Aside from the hermaphroditism of the pistil, 

 the abnormal flowers do not differ in appear- 

 ance from typical blossoms and bear their full 

 quota of six normal stamens. The stigmatic 

 anthers are well formed and filled with perfect 

 pollen indistinguishable from that produced in 

 typical anthers. In three per cent, grape sugar 

 as well as in cane sugar, pollen from the two 



Fig. 2. 



tjrpes of anthers show an equally high per cent, 

 of germinations. Eleven attempts were made 

 last spring to pollinate normal pistils with 

 pollen from abnormal flowers, pollen both 



