62 



DIV1S10S I. GENERAL Mu/< I'llOLOGV 



sense of the word and the cell from whi< h the) spring is the basidium. In spe< ies of 

 more simple character both expressions are used according to convenience. Among 



the manifold variations in individual cases which must be left for special description 

 there are at the same time a number oi ly recurring phenomena according 



the mode of abjunction, the numerical relations, and the ultimati shedding of the 

 abjointed porti< ins. 



As regards the form which may be exhibited by the phenomenon, the cross 

 septum may appear beneath the apex of the sporiferous cell, the apex itself being 

 usually expanded : the portion thus delimited is the spore; the breadth of its base is 

 about equal to that of the sporiferous cell. The simplest examples are most uredospores 

 (Fig. 26 1 and the teleutospores of Uromyces. A second case is that in which branches 

 grow at certain points from the sporiferous cell and these are either abjointed at the 

 point of insertion, which usually becomes much constricted after the manner of the 



-. 26. Puce itt ia graminis. 

 Small a hymenium; u 



in their equator, / a pair of teleu- 



per with a germ- 



c/ 



7. a — d Auricularia Auricula Jtuda mini of basidia and spores; 



successive stages of the development according to the letters. ,1 cylindrical terminal cell 

 of a hypha from which :-■ 



basidia puts out a long narrow] rf| from its upper 1 tnd the 



swollen :il which thl 



has fallen, /the d< nimerf.; four basidia are 



ions crossing one another in the cell: the of the 



figures! indicate the surface of the 



hymenium. /"after Tulasne highly magnified, a—dmaga. jootii 



sprouts in the species of Sprouting Fungi (p. 4), or they elonpate into slender stalks, 

 Sterigmata in the narrower sense mentioned above, and their swollen extremity forms 

 by abjunction a spore. Examples, to be again noticed, are to be found in the 



diomycetes, in Eurotium, Penicillium, Ilaplotrichum. Peziza Fuckeliana, &c. 

 Intermedial,' cases occur, as might be expected, between the extremes and 

 require no further description. 



A >porifernus cell or basidium may produce only one reprodui live Cell by acro- 

 genous abjunction. or several, even many, may he formed. The first is the case in 

 most species of the former of the two categories just mentioned, for instance in the 



lospores of Puci inia, Uromy< 1 s, and others. Tin basidia of Entomophthora are 

 examples of the second case, and those of most species of Tremella. Exidia, and 

 Auricularia Auricula Judae with long sterimna-shoois, the swollen apex of which 

 becomes a spore by abjunction (Fig. 27 (. 



