DIVISION I. GENERAL MORPHOLOGY. 



In compound spores each merispore germinates in the same way as a simple 

 spore or has the power of doing so (see Fig. 59 C}. It is not uncommon to see 

 a germ-tube proceeding from almost every merispore, even where they are many in 

 number, as in Pleospora herbarum and Cucurbitaria Laburni. Sometimes certain 

 merispores only germinate as a rule, and if the cells are arranged in a simple row 

 his'is usually the case with one or both the terminal cells of the row, as in Melogramma 



Bulliardii, Tul., Melanconis, 

 Tul., Aglaospora profusa, Not., 

 Exosporium Tiliae and the 

 stylospores of Cucurbitaria 

 macrospora. The merispores 

 which do not germinate gra- 

 dually give up their contents 

 to those which do 1 , that is, 

 their contents disappear and 

 are replaced by water in pro- 

 portion as the germ-shoots 

 develope. But their membranes 

 remain uninjured, suffering no 

 perceptible perforations. 



The sprout germina- 

 tion occurs in single genera 

 and species, as Saccharomyces 2 

 Exoascus 3 , Dothidea Ribesia, 

 Fr. 4 , and some species of Nec- 

 tria 5 , not to speak of certain 

 doubtful forms like Dematium 

 pullulans which will be de- 

 scribed further on. Small pro- 

 cesses with a very narrow base 

 sprout, like commencing germ- 

 tubes, from the surface of the 



FIG. 59. A Perttuaria communis. Optical longitudinal section of a spore , ,, 



germinating on a moist slide after long lying in glycerine. B Pertusaria Ujoplaca, SpOrC, men generally aSSUmC 



spore with germ-tubes. C Solorina saccata, germinating spores sp, after Tulasne . j V J ' ! 



from Sachs' Lehrb. ; , germ-tubes. B magn. 390 times. an elongated Or Cylindrical 



form, and finally are abjointed 



in the manner described above in the case of the sprouting Fungi. A second 

 and third or more sprouts may follow the first from the same point in the spore, 

 till its protoplasm is exhausted. The sprouts may be formed at any point in the 

 spore (Exoascus, Dothidea) or at fixed points, as at the two extremities of the 

 fusiform dimerous compound spore of Nectria inaurata, or on the whole surface 

 of the spore which is thus thickly covered over with sprouts which stand out from 



1 Tulasne, Carp. II, and I, p. 95. See also Cornu in Comptes rend. 84 (1877), P- J 3 2 ' 



a Reess, Unters. u. d. Alkoholgahrungspilze, Leipzig, 1870. 



3 De Bary, Beitr. I. Tulasne in Ann. d. sc. nat. ser. 5, V. See also section LXXVII. 



4 Tulasne, Carp. II. t. IX. 



5 Janowitsch in Bot. Ztg. 1865. 



