CHAPTER LVIII. 



MYCOSPHJERELLA TULASNEI AND SPH^ERULINA INTER- 

 MIXTA, OTHERWISE CLADOSPORIUM HERBARUM 

 AND DEMATIUM PULLULANS. 



BY PROF. DR. G. LINDAU, 

 Private Tutor at the Berlin University. 



296. Cladosporium Herbarum. 



IN the sub-order of the Sphseriacese (see p. 100, vol. ii.), species 

 from each of two genera of the family of the Mycosphterellacece 

 come under consideration here, whilst a third one will merely 

 receive cursory mention. The last-named is the fungus formerly 

 known as Lcestadia Bidwellii, and now as Guignardia Bidwellii 

 causing the black-rot disease in the vine, further particulars of 

 which are to be found in Handbooks on Phytopathology, such as 

 those of VIA LA (I.) and SORAUER (III.). The ascospores of this 

 fungus are unicellular, but occasionally bicellular when ripe. 



The very numerous species belonging to the genus Mycosphce- 

 rella (formerly SphcercUa), on the other hand, produce bicellular 

 ascospores ; and those of the genus Sphcerulina (see p. 379, vol. ii.), 

 even tricellular and polycellular ascospores. Of the first of these 

 two genera only one species is of interest to us here, namely, 

 Mycosphwrella Tulasnei on account of its conidial fructification 

 which, until recently, was still described under the name Clado- 

 sporium herbarum, given to it by H. F. Link, until its connection 

 with the Mycosphcerellacece was established by E. JANCZEWSKI (I.) 

 in 1893. This worker succeeded in tracing the development of 

 this new Ascomyces from the ascospores up to the production 

 of ripe perithecia (see Fig. 184), and in obtaining, as a secondary 

 fructification, the conidia (Fig. 185) with which alone we shall 

 deal in the present paragraph. 



Considered from the systematic standpoint, Cladosporium 

 herbarum is probably a collective species, and appears to differ 

 slightly in form under different conditions of cultivation. This 

 explains why G. FRESENIUS (II.) and P. A. SACCARDO (I.) described 

 what seems to be different species, as Penidttiwn cladosporioides 

 and Hormodendron cladosporioides respectively, whose proper place 

 as forms of Mycosphwrella Tulasnei was afterwards allotted them 



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