1 io 



DIVISION I. — (I EXI-.RAL MORPHOLOGY. 



the terminology here adopted. Secondly, the spore grows out into one or more 

 tubular processes with the chara< teristics of hyphae, more rarely with those of the 

 Sprouting Fungi. The two kinds are naturally connected together by intermediate 

 forms, and an instance of this has been already in effect given in Fig. 54. Other 

 instances and some partial exceptions in the simplest of the Chytridieae will be 

 described in different places in Chapter V. 



The modes of formation of sporangia in germination have been already 

 considered in the foregoing sections ; here, therefore, we have only the other 



1 i'.. 55. Pucciniii graminis. A pair of ti-Icutosporcs germinating «itli im and sporidia rf. n 



ermis of the under surface of thr teal I iris with a germinating 



Eporidium, the germ-tutx epidermal cell. D uredospore puttii .. rm-tube 



i In the empty membrane 

 i.ehrbuch. 



mode to depict, which may be termed tube-germination (Schlauchkeimung) and sprout- 

 germination (Sprosskeimung). 



The characteristic feature in tube-germination is that the spore grows out 

 at one or more than one spot in its surface into a tubular process which is of the 

 nature of a fungal hypha. This the first product of germination is accordingly known 

 as the.;-r rm-lnbe (Keimschlauch). If the tube receives sufficient nourishment it developes 

 directly in many cases into a mycelium or thallus like that of the parent, and it is there- 

 fore iheprimot Hum of the mycelium (Fig. 55 /)). In other cases its normal development 



