560 



the opinions of various writers on this subject, and gave as the result 

 of his own observations that the origin of the disease was evidently 

 connected with the appearance of a ramifying, filamentous fungus, 

 that the brown spots indicative of the same are secondary, and that 

 the decay arises from the vitality of the cells being destroyed by the 

 presence of the fungus ; and he concluded by adducing various facts 

 in proof of the correctness of his particular views. 



J. W. 



An Arrangement of the British Flora in accordance with the AU 

 liances and Orders of Professor Lindleifs * Vegetable Kingdom.^ 



Professor Lindley's great work, * The Vegetable Kingdom,' is so 

 certain to take rank among those of the highest authority in relation 

 to systematic Botany, that we have thought it would prove service- 

 able to the readers of the ' Phytologist,' to have before them a list of 

 the classes and alliances now recognized by the learned author of that 

 work ; together with a list of such of the orders and genera as are 

 represented by species in the British Flora ; but shortening the lists 

 of genera by omitting those of the cellular plants, and also such 

 among the vascular plants as fall under orders almost invariably re- 

 cognized and adopted by systematic authors, and hence sufficiently 

 familiar; for example, the numerous genera of Graminaceae andAste- 

 racege, or grasses and syngenesious plants, which are always brought 

 together in systems of classification. 



By separating the leaf-bearing cryptogamic plants from the rest; 

 the reticulate-veined monocotyledons from such as bear leaves with 

 parallel veins ; the Coniferae and Cycadeaceai from other exogens ; 

 and by taking RafBesia, Cytinus, Balanophora and their allies, for a 

 distinct class of themselves ; the author of ' The Vegetable Kingdom ' 

 forms seven primary groups, instead of the trinitarian number more 

 usually received. The following characters are given for these seven 

 "Classes." 



Asexual, or Flowerless Plants. 



Stems and leaves undistinguishable 1. Thallogens. 



Stems and leaves distinguishable 2. Acrogens. 



» Sexual, or Flowering Plants. 



Fructification springing from a thallus 3. Rhizogens. 



Fructification springing from a stem. 



