358 MORPHOLOGY, ETC., VASC. PLANTS [Bot. Absts. 



2428. den Doop, J. E. A. Ranunculus acris Linne met teruggeslagen kelkbladen. [Ran- 

 unculus acris L. with reflexed sepals.] Nederland. Kruidkundig. Arch. 1918: 155-157. May, 

 1919. — The rather frequent occurrence of specimens with this character, as noted by other 

 botanists, is recorded in various parts of Holland. — J. A. Nieuivland. 



2429. Dixon, H. H. Mahogany and the recognition of some of the different kinds by their 

 microscopic characters. Notes Bot. School Trinity Coll. Dublin 3: 3-58. 23 pi. 1919. — 

 See Bot. Absts. 3, Entry 2017. 



2430. Ensign, M. R. Venation and senescence of polyembryonic citrus plants. Amer. 

 Jour. Bot. 6: 311-329. 6 fig. 1919.— See Bot. Absts. 4, Entry 1555. 



2431. Ensign, M. R. A staining method for vascular tissue. Phytopath. 9: 180. 1919. 

 — Use hot water followed by nitric acid, dehydrate, stain in methylene blue, clear and mount 

 in castor oil, — R. E. Vaughn. 



2432. Gertz, Otto. Panachering hos Mercurialis perennis L. En morfologisk, anatom- 

 isk, och mikrokemisk studie. [Variegation in Mercurialis perennis L.] [Swedish with German 

 r6sume\] Bot. Notiser 1919: 153-164. 22 fig. 1919— See Bot. Absts. 3, Entry 2126; 4, En- 

 try 1557. 



2433. Guerin, Paul. L'Urera Humblotii H. Baillon et ses affinites. [Urera Humboltti 

 and its affinities.] Compt. Rend. Acad. Sci. Paris 168: 517-519. 1919.— See Bot. Absts. 4, 

 Entry 1728. 



2434. Henderson, Margaret \V. A comparative study of the structure and saprophytism 

 of the Pyrolaceae and Monotropaceae with reference to their derivation from the Ericaceae. 

 Contrib. Univ. Pennsylvania Bot. Lab. 5: 42-109. 10 fig. 1919. — Following a general intro- 

 duction and historical account of previous investigations, the writer presents the results 

 of her work on morphology and histology of a series of plants, studying the underground 

 root and stem systems, the epidermis, the leaves, the inflorescence and the flowers and flower 

 parts, as well as the fruit and seeds. The conclusions reached are that all of the supposed 

 differences between the Ericaceae and the Pyrolaceae break down except that the ovary is 

 completely five-celled in the Ericaceae and incompletely five-celled in the Pyrolaceae. The 

 distinction is so slight that it seems unreasonable to use it as a basis for separating the two 

 families. The only distinction that holds between the Pyrolaceae and the Monotropaceae 

 is the absence of chlorophyll in the latter; hence these families differ from the Ericaceae 

 only in their gradually increasing saprophytism. — John W. Harshbcrger. 



2435. Lohr, P. J. Untersuchungen fiber die Blattanatomie von Alpen- und Ebenenpflanzen. 

 [Investigations on the leaf anatomy of alpine and prairie plants.] Rccueil Trav. Bot. Neerland. 

 16: 1-62. Fig. la-J^b (8), lab. 12. 1919.— See Bot. Absts. 4, Entry 240. 



2436. Matousciiek. (Rev. of: Mihaltjsz, V. A gyermeklancfu tokoksanyan rendelle- 

 nesen megjeleno levelke. (Abnormal leaf formation on the floral stem of Taraxacum officinale.) 

 Bot. Kozlemdnyek 16: 109-115. 6 fig. 1917.] Zeitschr. Pflanzenkrankh. 29: 52. 1919 — 

 Author describes purely teratological phenomenon in Taraxacum; i.e., foliation of floral stem. 

 — H. T. Gussow. 



2437. McLean, R. C. Studies in the ecology of tropical rain-forest; with special reference 

 to the forests of south Brazil. I. Humidity. Jour. Ecology 7: 5-54. 1 pi. , 21 fig. 1919. — See 

 Bot. Absts. 4, Entry 196. 



2438. McMurray, Nell. Stamens of meadow parsnip. Amer. Bot. 25: 69. 1919. 



2439. Mel vill, J. Cosmo. Teratology in Papaver orientale. Jour. Botany 57: 226. 1919. 

 — A brief note on the occurrence of a gamopetalous corolla on this plant. — A'. H[. Wiegand. 



2440. Namakawa, Isawo. Uber das Offnen der Antheren bei einigen Solanaceen. [De- 

 hiscence of the anthers of some Solanaceae.] Bot. Mag. Tokyo 33: 62-69. 7 fig. 1919.— The 

 dehiscence mechanisms are described in some detail for the following: Lycopersicum cscu- 



