66 DIVISION I.—-GENERAL MORPHOLOGY. 
In the simple successive serial or concalenate forms the abjunction is repeated 
beneath the insertion of each propagative cell in the same direction and in the same 
form as in the case of the first cell. If the line of abjunction in that case was broad 
and transverse, the extremity of the sporophore beneath the youngest spore elongates 
to a definite extent and abjunction again takes place by formation of a new trans- 
verse wall; if the first sprout which becomes a spore has a constricted insertion, then 
after each abjunction a similar sprout with constricted base is developed beneath it 
from the persistent end of the sporophore and in turn undergoes abjunction. In 
this way a chain of similar segments is produced, in which the cells are younger in 
proportion as they are nearer to the extremity of the sporophore from which they are 
formed. The number of cells in a chain 
may be considerable, 20-30 or more. 
Examples are to be found in the gonidia 
of most of the Erysipheae, Cystopus, 
Penicillium, Cordyceps, and the Aecidieae, 
in the uredospores of Coleosporium, 
Chrysomyxa, and many others (Fig. 33). 
Branched serial or concatenate forms 
arise when one or more outgrowths stand- 
ing side by side on the apex of a filiform 
sporophore are abjointed, and then by 
repeated abjunctions produce a structure 
not unlike one of the Sprouting Fungi 
(Fig. 3). The first sprout-cell puts out 
one new protuberance from the apex 
which is remote from the sporophore, and 
this new cell and each succeeding one 
can do the same; a row of cells is thus 
formed in which the members are succes- 
sively younger as the apex is approached. 
Each of them can then form one or more 
Cee ee eee ae herzus lateral sprouts below its apex which adjoins 
is further explained in the text on . & Eurotium A. - . 
Pitta plabeurs end sach sn m «7 the cell next above it, and these new cells 
sergmta on which the formation of spores je begining’ and their progeny are similar to the first 
Spores; 1 youngest spore of a chain. a magn. 39, the rest 00 (Fig, 34). According as the lateral sprouts 
on cells of successive orders are placed 
singly or in a whorl of two or more members, chains are produced in which the 
branches vary in number and form. The cells of all orders are so many repro- 
ductive cells which are similar to one another in all important points and become 
ultimately detached from one another. Examples of this kind occur in the forms 
named by Fresenius! and Riess? Periconia, in which sprout-chains are collected 
together into a compact head at the extremity of a filiform sporophore, and in the small 
gonidial forms of Pleospora and species of Fumago and its allies in the Sphaeriaceae ®, 




1 Beiträge. 2 Bot. Ztg. 1853. 
® Tulasne, Carpol. IT. 
