NOTES AND ABSTRACTS. 



145 



Cucumber Leafspot caused by Stemphylium cucurbitacearum n.sp. By 

 Geo. A. Osner (Jour. Agr. Res. vol. xiii. No. 5, April 1918, pp. 295-306 ; 4 plates I. — 

 During the summers of 1915 and 1916 a peculiar leafspot disease of cucumbers 

 was observed at Plymouth, Ind., and Bowling Green, Ohio. The spots varied 

 in size from 02 to 1 ^ mm., and were circular or angular in outline. The centre of 

 the spots was light yellow brown with a reddish brown border. From these 

 spots a fungus of the genus Stemphylium was isolated. This was found to 

 attack the leaves of cucumbers, gourds, and allied plants. No data regarding 

 this disease has been published, and the author believes it to be a new species 

 and has given it the name of Stemphylium cucurbitacearum.. It is found that 

 the fungus develops best when the weather is cool and when moisture is abundant ; 

 it can survive the winter, and is distributed by wind, rain, insects, &c. Bordeaux 

 mixture is of value in the control of the disease, and this with suitable cultivation 

 and destruction of attacked plants should be followed as normal control measures. 



A. B. 



Cycnoches ehlorochilon. By R. A. Rolfe (Orch. Rev. xxvi. p. 211, rig.). — 

 An illustration of the female flower of this fine species, together with its history. 

 It differs from the male in having an extremely short stout column with triangular 

 fleshy wings, and it is remarkable that the male was well known for upwards 

 of half a century before the other sex appeared. The seeds from such a flower 

 may number nearly four millions, as was estimated from the contents of a capsule 

 taken from an imported plant. — R. A. R. 



Cycnoches ventricosum. By R. A. Rolfe (Orch. Rev. xxvi. pp. 189-191). — 

 The history of a species which was so completely confused with C. Egertonianum, 

 Batem. (now known to belong to another section of the genus), that inflorescences 

 of the two are shown by Bateman as produced by the same pseudo-bulb. It 

 was an error of the artist, who instead of showing the female flower of C. Egertoni- 

 anum introduced the males of the earlier C. ventricosum, and it was not until 

 the phenomena were repeated at Kew that the secret of the mistake was discovered. 

 Some further confusion between C. ventricosum and C. ehlorochilon is pointed out, 

 and it is shown that a real female of C. ventricosum and a sketch of the same are 

 preserved in Dr. Lindley's Herbarium at Kew. — R. A. R. 



Cymbidiella, The genus. By R. A. Rolfe (Orch. Rev. xxvi. pp. 57-59, 

 fig. 6). — A paper showing that the three epiphytic Cymbidiums from Madagascar 

 form a distinct genus, whose characters are given, together with the history of the 

 three species, C. flabellata, C. Humblotii and C. rhodochila, with a figure of the 

 latter. C. rhodochila grows naturally in clumps of the fern Platycerium, at an 

 elevation of 1,800 to 2,000 feet, and has proved exceptionally difficult to cultivate. 

 C. Humblotii grows on the stems of the palm, Raphia madagascariensis. A fine 

 specimen of C. Humblotii is figured in the same volume. — R. A. R. 



Cvtisus albus, Link. By O. Stapf (Bot. Mag. t. 8693 ; Jan. 1917). — Native 

 of Spain and Portugal. A well-known plant, first introduced about 1739, and 

 again in 1770. Flowers usually white, but sometimes flushed with pink. The 

 illustration shows the pink form. — F. J. C. 



Daphne Giraldii Nitsche. By O. Stapf (Bot. Mag. t. 8732 : October T917). — 

 Native of China. A hardy shrub with glabrous golden yellow flowers. It is 

 sometimes confused with D. tanguiica Maxim., a species having persistent 

 leaves and bracteate inflorescences. — L. C. B. 



Disanthus cercidifolia Maxim. By W. J. Bean. Hamamelidaceae (Bot. 

 Mag. t. 8716; June 1917). — Native of Japan. A hardy shrub, whose chief 

 value lies in the rich autumnal tints of its foliage. It does not often flower in 

 this country and in the absence of seeds may be propagated by layers. — L. C. E. 



Douglas Fir, Bark-Beetles infesting the. By W. J. Chamberlin (U.S.A. Exp. 

 Stn., Oregon, Bull. 147, Jan. 191 8). — There is in the United States at the present 

 time about 2,200 billion feet of standing coniferous timber, of which 30 per 

 cent., or 650 billion feet is Douglas Fir, Pseudotsuga taxi folia. This is the 

 dominant tree of Oregon, and is destined to be the leading commercial tree 

 of the future. 



No other commercial tree of importance has such a wide range. Its 

 magnificent size, high commercial value, rapid growth, as well as the ease with 

 which it lends itself to silvicultural management, make it an ideal tree with 

 which to deal. 



At the present time it is estimated that the Douglas Fir pitch moth causes 

 damage which reduces by 15 per cent, the amount of No. 1 clear material obtained 

 from Douglas Fir, in parts of the Rocky Mountain region. Elsewhere timber 



beetles, borers, and bark -beetles cause an immense loss of mature timber and 



also kill off the younger trees. — A. D. W. 



VOL. XUV. * L 



