MODE OF LIFE OF THE PAKASITK Fl.M.l. 13 



haustorium on an endophytic inyceliuin is that exhibited by 

 the parasite (_'i/fnj>/'x ; the hyphae semi ott very tine h'lament> 

 which penetrate the walls of a host-cell and swell up to little 

 button-like sacs. Many Peronosporeae (P. y///// ///<"". P. nivea, 

 P. vifico/ti and 7V////<y^///",v/ innnimm) have liaustoria of tin- 

 form just described, whereas others have them thread-like and 

 branched (P. mlotlnm of the woodruff), or crenately lohed i /'. 



Amongst the species of Uredineae and Ustilagineae, haustoria 

 are not uncommon and present many varied forms. They are, 

 however, few in number, or confined to certain parts of the 

 mycelium, so that they may be easily overlooked. 



liaustoria in the form of loin,' sacs of various len-th> are 



produced by J//"///y /.-<"/" dm i>i rtimut in the tissues of both 

 cowberry and fir-needle. Gyrnnosporangium in juniper has 

 occasionally very delicate button-like liaustoria. En<]L>l<i/ll n m 

 sempervivi in the house-leek has haustorial bram-ln- whii-li. 

 according to Zopf, are coiled together and anastomose frequently 

 with each other. 7V/<///r////<> amongst the Ustilagineae possesses 

 short branched liaustoria resembling one-sided clusters, and 

 M,inii<>tiii-iiiniii < inl'i'i* an 111 has similar haustorial-tufts even more 

 branched. 1 Um<-ii*ti* y/ ( -///y(//o/_////<.//. x in H< i>lim t,-ll,,ln lias spirally 

 coiled haustnrial hyphae, while Ti//>ti" < n<f>>j >/' ////", >s'n/v(x//o/-////// 

 saponariae* and many species of fV//"//", liave liaustoria with 

 the form of knotted hyphae. 



Anmngst the Hymenomyeetes. E'-uh.i.^iJiinn vaccinii 

 a mycflium which jH-rmeates the host-tis>ut-s with 

 hyphae, l.ut the only liaustoria are hyphae which here and 

 penetrate into a cell. Xu liaustoria have as y.-t 

 f'dimd amongst the Basidiomycetes, 8 PyrciiMin\r,-tes, ,,i- 

 l)isci.myretes. 'I'lie two groups last-mentioned bave an int.'i- 

 i-.'llular or intracellular mycelium, wbich as a rule ipiickly 

 kills all cells with which it comes in contact. 



1 ,s'< ///, /,,/;/( naturforsch. Get. .!///'///. issu. I'l.it.-.- I. and I\'. 

 * Pringtheim'i Jahrtntch, Isii'.i. Platw \'ll.. \lll 



^.inillXV li:is ti-_'lll'i-<l liail.-l<iri;i in lnyr|-|il/a <it lii-rrli. \\itlmilt l|o\\i-\i-r 



i|i-tcriiiiiiiir_' i-xartly \\li--tli.-i tln-y l.t-lnniri-il tu a H \ IIP IMMIIS . . [ . I;.. al-> 

 .--innlar ni'_'an.~ i>n m\ :'<>rlii/.'i |u mlur.-il l,\ mil- nf tin- Till"' 



