Pflanzenkrankheiten. — Floristik etc. 651 



the stem, and the leaf bases rupture transversely along the line of 

 insection. The fungus first attacks the parenehyma and the prosen- 

 chymatous cells of the peripheral upper region of the rhizome. 

 Enzymic secretions cause disintegration and the swelling of the 

 base of the stem is brought about b) r metaplastic changes in the 

 tissues. It seems probable that the mycelium can only penetrate the 

 base of the outermost leaves in a comparatively young condition, as 

 the chance of infection is restricted and the disease spreads but slowly. 

 A brief description of the fungus is appended, with a compa- 

 rison with Ustilaginoidella mnsoeperda. W. E. Brenchley. 



Essed.Ed., Rise disease caused by Ustilaginoidella graminicola. 

 (Ann. Bot. XXV. p. 364—368. 1911.) 



The fungus attacks rice plants in Guiana, at any stage o* 

 development, tirst appearing as dark brown spots on the leaves 

 and sometimes on the sheaths. The general aspect is that of rust. 

 A species of Panicum suffers from the same disease. The brown 

 spots are nothing but pegmation, and hyphae run through and be- 

 tween the epidermal cells, entering and emerging from the stomata. 

 Numerous spores are formed. The prosenehyma and wood vessels 

 are only seized upon in an advanced stage of disease. 



A brief descriptive aecount of the fungus is given, with a com- 

 parison with Ustilaginoidella oedipigera. W. E. Brenchley. 



Dörfler, J., Herbarium normale. Cent. LIII und LI V. (Wien. 

 III. Barichg. 36. 1911.) 



Interessante Pflanzen kamen auch diesmal zur Ausgabe. Die 

 seltensten und neuen Formen sollen hervorgehoben werden: 



Adonis wolgensis Steven aus Siebenbürgen, Cardamine amara 

 var. erubescens Peterm. (Bayern), Malcolmia Paucicii Adamov. 

 (Dalmatien), Thlaspi Goesingense Haläcsy (vom locus classicus in 

 N. Oester reich), Viola Kupfferiana W. Becker (Schweden), 

 Stellavia hybrida Dörfl. (= St. alpestris X longifolia, Finnland), 

 Cytisus bosniacus G. Beck (vom loc. class., Bosnien), Rosa dnme- 

 torum Thuill. f. interposita Schlimp. (Sachsen, loc. class.), Scabiosa 

 silaifolia Velen. (Bosnien), Centaurea Prodani J. Wagn. (Ungarn), 

 C. Gerstlaueri Erdn. (Bayern, loc. class.), Centaurium Barrelieri 

 (Duf.) Dörfl. (Spanien loc. class.), Stachys nitens Ika var. serpentina 

 Maly (Bosnien), Hyssopus cretaceus Dub. (Russland), Statice balui- 

 sienses Fries (Schweden, loc. class.), Tulipa hungarica Borb. (Un- 

 garn, loc. class.), Eriophorum intercedens Lindb. fil. var. medium 

 (Anderss.) (Finnland); Aira Neumanniana Dörfl. = A. bottnica X 

 caespitosa (Finnland), Koeleria polonica Domin (Galizien); Festnca 

 Holmbergii Dörfl. nova hybrid. (= F. arimdinacea X Loliian perenne 

 (Schweden)); Festuca gigas Holmbg. nov. hybrid. (— F. arundina- 

 cea >( gigantea Kult. (Schweden); F. Ascher soniana Dörfl. (= F. 

 arimdinacea X elatior (Schweden), Agropyrum intermedium (Host.) 

 Beauv. lusus pseadocristatiim Hackel (Tirol); Pilularia minnta Dur. 

 f. submersa H. Glück (Sardinien). Matouschek (Wien). 



Kuckuck, P., Ueber Eingewöhnung von Pflanzen wär- 

 merer Zonen auf Helgoland. (Bot. Zeit. I Abt. LXVIII. p. 

 49—86.) 1910.) 



Der Verf. berichtet über Akklimationsversuche in Helgoland 



