l62 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



The gall-forming eelworm, Heterodera radicicola Mull., is the best 

 known and does the greatest amount of damage in Britain, being 

 particularly troublesome on the roots of Tomatos and Cucumbers. 

 Among other plants attacked are Vines, Potatos (tubers), Phloxes, 

 Roses, and Balsams. Its life-history is given, and preventive measures 

 are discussed. 



The Sugar-beet eelworm, Heterodera Schachtii Schm., differs from 

 H. radicicola in not forming galls or knots on the roots of the host- 

 plant. It is a serious pest in the Sugar-beet fields in Germany, and 

 in addition is known to attack about fifty other plants, including 

 Potatos, Cabbages, Radishes, and Spinach. 



A third eelworm, Tylenchus devastatrix Ritzema Bos, causes one 

 form of Clover sickness and also " tulip root " or segging " of Oats. 

 It also attacks Strawberries, causing the leaves to become crinkled 

 and deformed at an early stage and the plants to rot off at the ground 

 level. 



Aphelenchus fragariae Ritzema Bos, is the cause of a second 

 disease of Strawberry plants, known as the " cauliflower " disease. 

 Diseased plants present a fasciated appearance, the stems and leaves 

 being consolidated into an irregular fleshy mass, suggesting a Cauli- 

 flower. The flowers also assume monstrous forms. 



Tylenchus tritici Bastian, is the cause of " ear-cockles " of Wheat. 

 The grain, which is the part attacked, becomes changed into a roundish, 

 blackish-purple mass, somewhat smaller in size than a normal grain. 

 When it is crushed, and examined under the microscope, it is seen to 

 contain eelworms. 



The Fern eelworm, Aphelenchus olesistus Ritzema Bos, forms 

 brown streaks or patches on the living fronds of various kinds of Ferns. 

 The shape of the brown patches is determined by the venation of the 

 particular Fern attacked, since eelworms in the tissues of a Fern frond 

 cannot penetrate beyond the portion circumscribed by a vein. In 

 addition to Ferns, this eelworm attacks the leaves of many kinds 

 of flowering plants, e.g. Chrysanthemum, Begonia, Calceolaria, 

 Gloxinia, and Coleus, forming more or less extended brown patches, 

 frequently mistaken for the injury done by thrips. — A. S. 



New Plants from Guatemala and Costa Rica. By John 

 Donnell Smith {Bot. Gaz. June 1913, pp. 431-438, and July 1913, 

 pp. 51-62). — Descriptions of new species of Rheedia, Caryocar, 

 Maytenus, Meliosma, Philocarpus, Calyptrella, Gilihertia, Basanacantha, 

 Perymenium, Arctostaphylos, Cordia, Ahutilon (2), Comocladia, Dalea, 

 Dioclea, Phaseolus, Platymiscium, Lonchocarpus, Derris, Diplotropis, 

 Mimosa, Pithecolohium, Aralia, Manettia, Rondeletia, Ipomoea, 

 Cacabus, Salvia, Gaiadendron, and Euphorbia. — G. F. S. E. 



New Plants from Idaho and Nevada. By A. Nelson and J. F. 

 Macbride [Bot. Gaz. May 1913, pp. 372-383). — ^New species of 

 Calochortus, Clematis, Delphinium, Horkelia, Astragalus, Nemophila, 



