FUNGI IMPERFECTI 



XXXV. GLCEOSPORIUM: OTHER SPECIES 



335 



In addition to the preceding, and to the various fungi already 

 discussed which have gloeosporial stages, the following inducing 

 diseases of some shrubs or trees may be briefly cited. 



Glceosporium Tiliae Oudem. 1 occurs throughout a large portion 

 of northern Europe as an important parasite of the linden (Tilia 

 Ulmifolia). In late spring the clear, circular spots appear upon the 

 leaves, generally irregularly distributed and becoming with age 

 yellowish brown and separated from the healthy tissue by a darker 

 brown line. The spots may also occur on the leafstalks and on 

 the twigs as small, sunken areas. Severe attacks upon the leaf- 

 stalks cause a premature defoliation. The acervuli appear most 

 abundantly upon the upper surfaces of the spots. The conidia are 

 generally ovate, elliptical or falcate, and measure 10-18 x 4-6 p. 



Glceosporium Juglandis (Lib.) Mont, is a cause of a serious leaf 

 blight of the butternut (Juglans cincrea). The fungus has been 

 found practically throughout the range of the butternut. The effects 

 of the fungus have often been severe in the northeastern states, 

 where almost complete defoliation of some trees has been noted 

 as early as the latter part of July in New York, and early August 

 in Massachusetts. Quite generally the fungus causes a defoliation 

 which is earlier than the normal. The leaves affected are covered 

 with irregular brown spots, which rapidly induce ripening, and 

 defoliation results. 



Gloeosporium cingulatum Atkinson 2 is an anthracnose of the 

 privet (Ligustnnn vulgare). The fungus attacks the young twigs, 

 producing at first small dark, sunken spots, but eventually girdling 

 and killing the twigs. It is considered distinct from Glaosporium 

 Ligiistrinum Sacc. 



Gloeosporium laeticolor Berk., while widely distributed, occurring 

 particularly upon peaches and apricots, has apparently never been 

 reported of serious importance in the orchard. 



Glceosporium apocryptum E. & E. on leaves and young twigs 

 of the Norway maple is an important disease in the nursery. 



1 Laubert, R. Eine wichtige Gloeosporium Krankheit der Linden Zeitsch. f. 

 Pflanzenkr. 14: 257-262. pi. 6. 1904. 



2 Atkinson, Geo. F. A New Anthracnose of the Privet. Cornell Agl. Exp. Sta. 

 Built. 49 : 306-314. figs. 1-4. 1892. 



