' '4 



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 Labium. 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 Melogramm a 



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 theirmembranes 

 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 

 spore, then generally assume 

 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 Mine 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 "I Nectria inaurata, or on the whole surface 

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



FIG. 59. A Perlusaria communis. Optical longitudinal section of a spore 

 germinating on a moistslide after Ion;; lying in glyceril 



spore with germ-tubes. C Solorina saccafa, germinating spores sp, after I 

 from Sachs' Lehrb. ; s germ-tubes. B magn. 390 times. 



' Tulasne, Carp. II, ami I, p. 95. See also Cornn in Comptes rend. 84 (1877), p. 132. 

 '-' Reess, Unters. vi. d. Alkoholgahrungspilze, Leipzig, 1S70. 



1 l Bary, Beitr. I. — Tulasne in Ann d. sc. nat. >■ r. ;. Y. Sec also section LXXYII. 

 ' Tulasne, Carp. II. t. IX. 

 • Janowitsch in Bot. Ztg. [865. 



