110 



DIVISION I. GENERAL MORPHOLOGY. 



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

 tubular processes with the characteristics of hyphae, more rarely with those of the 

 Sprouting Fungi. The two kinds aie 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 



FIG. 55. Pitccinia framinis. A pair of teleutospores germinating with promycelium and sporidia sf. B 

 promycelium detached. C epidermis of the under surface of the leaf of Serteris vulfaris with a germinating 

 sporidium, the germ-tube of which has penetrated into an epidermal cell. D uredospore putting out a germ-tube 

 fourteen hours after being placed on the surface of water ; four equatorial germ-pores are seen in the empty membrane 

 of the spore. C. D magn. 390 times, A. B more highly magnified. From Sachs' 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 \\\e germ-tube (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 tioGprimordium of the mycelium (Fig. 55 /?). In other cases its normal development 



