Pflanzenkrankheiten. — Bryophyten. 299 



Nowell, W„ Rosellinia Root Diseases in the Lesser Antil- 

 les. (West Indian Bull. XVI. p. 31 — 71. 7 pl. 1916.) 



After giving a historical resume of observations on diseases 

 caused by Rosellinia, both in the West Indies and elsewhere, 

 the writer goes on to describe five species of Rosellinia known to 

 him. These are: R. Pepo, Pat., R. bunodes, B & Br., both of which 

 cause disease in a number of cultivated plants; an at present unde- 

 termined species of Rosellinia attacking cacao; and two species 

 provisionally referred to R. bothrina, B. & Br. and R. subiculata, 

 Sacc, which are not at present associated with any disease. 



In the case of the pathogenic species. the ränge of hosts is a 

 very wide one, but the cultivations most affected are thoseof cacao 

 (in all the islands), coffee (in Guadeloupe and Martinique), 

 limes (on new Clearings in Dominica), and arrowroot (in the in- 

 terior districts of St. Vincent). 



The disease on cacao is usually caused by R. Pepo, and in most 

 cases is communicated from the roots of dead or dying shade trees. 

 The disease on limes and coffee may be caused by either R. buno- 

 des or R. Pepo. The first cases in new Clearings are usually asso- 

 ciated with forest stumps left to decay. Subsequent cases arise from 

 the spread of the fungus from tree to tree along the roots, or by 

 infection from surface soil rieh in decaying vegetable matter. 



Infested trees may be killed gradually, by progressive invest- 

 ment of the roots, or quickly by the destruetion of the bark round 

 the collar. 



In conclusion preventive measures, chiefly those of sanitation, 

 are discussed. E. M. Wakeneid (Kew). 



Nowell, W., The Fungi of Internal ßoll Disease. (West In- 

 dian Bull. XVI. N° 2. p. 152-159. 1917.) 



The author gives a preliminary aecount of four species of fungi, 

 designated A, B, C, and D, which oeeur in green cotton bolls in 

 the West Indies. The four forms agree in general characters, 

 and are obviously related to such species as Nematospora Coryli, 

 Peglion, Nematospora Lycopersici, Schneider. Eremothecium Cymba- 

 lariae, Borzi, etc. Species B is considered to be probably identical 

 with Eremothecium Cymbalariae. Discussion of the affinities of the 

 group is reserved pending the acquisition of further information. 



E. M. Wakeneid (Kew). 



Tabor, R. J. and K. Barratt. On a Disease of the Beach 

 caused by Bulgaria polymorpha, Welt. (Ann. Appl. Biol. IV. p. 

 20-27. 1 pl. Sept. 1917.) 



A gumming disease of old pollard beaches is described, which 

 was found to be associated with the presence of Bulgaria polymor- 

 pha, Welt. Mycelium isolated from the diseased bark produced 

 fruetifications of Bulgaria, and conversely the disease was produ- 

 ced in a pollard by grafting in a piece of diseased bark, and also 

 by introducing the mycelium of Bulgaria. 



Young, vigorous trees resisted infection, and it is therefore 

 concluded that Bulgaria is a dangerous parasite only on old or 

 weakened trees. E. M. Wakefield (Kew). 



Mac Leod, J., Quantitative Description of Ten British 



