4G 



STATE HORTICULTURAL SOCIETY, 



POLLEN. 

 a.LILY CERMINA- 

 TINC, hADDER 

 TONGUE, C.TRADE5 

 CANTIA,d. CELLU- 

 LOSE- FLUG IN TUBE. 

 jessic j-Bum. . *w"»i««- 



Fig. 21. 



place, as in the Fuchsia, where the 

 tube starts from one of the three cor- 

 ners of the pollen. There are certain 

 places on the pollen of abutilon and 

 mallow where an opening is made like 

 the taking off the lid of a tea-kettle. 

 As the tube grows down the style, the 

 protoplasm runs out of the pollen into 

 the tube. In a short time all of the 

 protoplasm passes into the tube, includ- 

 ing the two nuclei. The long germina- 

 tive nucleus passes down the tube first, 

 the other nucleus following. 

 Germinating pollen may be taken from stigmas which are a little past the 

 fresh state. They may also be grown in an artificial way. 



In some cases, as the lily, some of the sticky substance found on the stig- 

 mas may be placed on a glass slide, and in this may be placed some pollen. 

 Over all is placed a thin cover glass, and the slide is put in damp air for a day 

 or more. The germinating pollen may be stained an aniline blue, or a weak 

 tincture of iodine I found better, and then the nuclei are made more promi- 

 nent. Pollen may be germinated on a slide in a preparation of syrup made of 

 white sugar. Put j)ollen on a cover glass, and syrup on the pollen, and care- 

 fully invert the cover glass and place the suspended drop over a well on a slide, 

 which is kept in moist air. 



Occasionally may be seen in the pollen tube, a slimy plug of cellulose, the 

 use of which is not understood. Figures 20 and 21 should be studied in this 

 connection. 



Dr. Beal: Among the smallest and most puzzling plants to deal with are 

 the smuts, rusts, mildews, and moulds which often do immense damage to our 

 crops of grain and fruits. It was once thought that these mysterious plants 

 were beyond the possibility of investigation, and that there was no use in trying 

 to find remedies. We know better now, and believe that there is as promis- 

 ing a field here for good, hard work as there is in economic entomology. We 

 present these short, illustrated papers on some of the fungi which interest 

 horticulturists. To tell us something of the pear and quince fungus, Rmstetia 

 aurantiaca, I call on J. C. Stafford: 



This fungus is found on the pear, 

 quince, and hawthorn. It is generally 



found on small twigs not exceeding one- 

 half an inch in diameter. The spores 

 lodge on the tender bark of the twig 

 and there sink down, causing the tender 

 bark to swell out around them, thus 

 forming a pit which becomes covered 

 over with a portion of the bark as the 

 twig grows. This bulging out is con- 

 tinued and results in a knotty, oblong 

 enlargement of the twig, about three 

 times its original diameter and two times Fig. 22. 



as long as thick. This enlargement of the host plant is very rough 

 scraggy and is generally covered with white silky fuzz about an 



UINCE&PEAR 

 FUNGUS on ^aiBilu iunflaw, 



and 



eighth 



