710 



They have no relation to acrogens, but they agree with endogens in 

 the presence of sexes and sometimes in the ternary structure of their 

 flower; they have however scarcely any spiral vessels, and their seeds 

 appear, as far as they have been examined, either as some say, to 

 want the cotyledons and axis of other flowering plants, or to lose 

 themselves in a mass of pulp from which they are almost indistinguish- 

 able. In their amorphous succulent texture, in their color, often in 

 their putrid odour when decaying, in the formation of a mycelium or 

 spawn, which is evident in Helosis and is with good reason suspected 

 to exist in others, and in their parasitical habits, these plants resem- 

 ble fungals, while in their flowers and sexes they accord with Arum- 

 worts or similar endogens." — L. V.K. 83. 



It appears to me very clear that Mr Lindley is mistaken in 

 supposing any points of correspondence between the flowers of 

 of the rhizogens and those of Arumworts, except such general corre- 

 spondence as exists between all flowers. I could wish this learned 

 botanist had pointed out a single point of accordance not equally 

 applicable to all the phoenogamous plants. I confess my own convic- 

 tion that there are but two of the primary classes with which the 

 rhizogens can be associated : if not in reality constituting a separate 

 class, as Mr. Lindley supposes, they must be either fungoid exo- 

 gens, or phanerogamous fungi. They partake of the characters 

 of each class so strongly, so decidedly, that should further investiga- 

 tions prove them to be fungi, they must necessarily occupy the very 

 margin of the group of thallogens, and precisely at the spot where it 

 most nearly approaches the group of exogens. On the other hand, 

 should they prove to be exogens, then, certain decidedly fungoid 

 characters must lead us to place them at the extreme margin of 

 the group of exogens, where these approach the thallogens. 



From these observations the following formula results. 



ENDOGENS. 



DiCTYOGENS. 



EXOGENS. 



Rhizogens. Gymnogens. 



THALLOGENS. ACROGENS. 



