212 BOTANICAL GAZETTE [march 



tube 



penetrate 



sperm 



integument. The tube is occupied by an endo- 



correspondingly enlarged and amoeboid in outline. There is also a short chalazal 

 haustorixmi. The tapetal layer of the inner integument eventually becomes cuti- 



funiculus are imperfect 



especi, 



among the^^mpetalai 



mibedded m the heavy integument 

 through the micropyle.— J. M, C. 



tea. — ^HrxcHisoN^3 



leuros virescens, the so-caUed **red rust*' of tea. This remarkable alga is the 



greatest 



am 



blight. This *^bUght'' alga is one of the Chroolepidae, and attacks the leaves of 

 the tea plant, completely piercing them; but the serious form of attack is upon 

 the cortex of young stems. The alga occurs as orange-yellow, roughly circular 

 patches on the upper surface of the host. It is propagated from these patches 

 either by the discharge of zoospores under conditions that favor swimming, or 

 by the breating-off of the sporangium and its transportation bodUy by the wind. 

 The attack on young stems is intimately connected with their rough surface, all 

 the young algal patches bemg found m the cre\ices of this surface. K the young 

 shoot grows rapidly, it may outstrip the alga and "no permanent mfection takes 

 place;" but if the young shoot grows slowly, the alga is able to penetrate and 

 destroy it-J. M. C 



has undertaken a detailed study of die histology 

 species of Puccinia formerly included imde 



The 



rusts. 



jt 



r-, gramnts, P. rubigo-vera, and P. cormata, and more recently broken up into 



a greater number of species on tbe basis of botb morphological and phj-siological 



characters. The investigation was begun at Cambridge in 1903, at the suggestion 



of the late Professor ^Iaesh.^^ Ward, and has been continued at Pretoria, at 



toe Transvaal Department of Agriculture, where the author is mycologist. This 



tust paper deals with the development of the uredo-mycelia, and the principal 



rj^ts are as foUows: In the eariy stages of the mycelia, these species exhibit 



<»stmctave morphological characters; the sub-stomatal vesicle is of a definite 



or each species; the haustoria of some species are very distinctive; and 



i species a well-developed appressorium is present, while in others it is 

 not so evident— J. M. C. f ^ 



M^J^^^^^^^' ^" ^■' C«P^^<^»ros virescens Kunze: the "red rust" of tea. 

 Menx^^art. .^^c India BoL x :no. 6. pp. 35. pis. 8. rgoj. 



Ann.T= Z'^' ^' ^°^^" ^^ '^^'■^^ ™^^- ^- The development of their uredo-mycelia- 

 Anmls of Botany 21:441-466. i^. ^^j. 1907. 



