ENDOSPHAEEA. 



551 



to have an injurious effect on its host, beyond killing a few 

 isolated leaves. 



End. rubra Schroet. occurs in leaves of Mentha aquatica and 

 Peplis Portula. 



Phyllobium dimorphum Klebs. Found in leaves of Lysi- 

 machia Nummidaria, Ajuga reptans, Chlora serotina, Erythraea 

 Centaurium. This endophyte may either penetrate into living 

 leaves and there go through its life-history, or it may do so 

 in dead leaves. The zygozoospores have only two cilia, and 

 enter the leaves chiefly through the stomata of the lower 

 surface. Inside the leaf they form long filaments, which make 

 their way between the elements into the vascular bundles of 

 the leaf-ribs, and follow the course of the spiral vessels. 

 Eesting- spores are formed, and 

 give the veins of the leaf a 

 rosary -like appearance. Male 

 and female gametes are pro- 

 duced from the resting cells, and 

 copulate to form zygozoospores. 

 The host-plants are not injured 

 by this endophyte. 



Chaetophoraceae. 



Most of the species are aquatic 

 algae which live independent or 

 as epiphytes. 



Endoclooium polymorphum 

 Frank (see Chlorosphaera endo- 

 phyta Klebs). This form lives 

 endophytic and sometimes intra- 

 cellular in living or dead leaves 

 of Lemna. 



Entoderma Wittrockii Wille 

 occurs inside the wall, of Ectocarpus (Fig. 327). 



Periplegmatium and Phaeophila live endophytic in living 

 algae. 



Trentepohlia endophytica (Eeinsch). In living cells and 

 intercellular spaces of Jungermanniaceae (e.g. FruUania dilatata) 

 and kills them. 



Fig. Zt^t. — Bntoderma Wittrockii in the 

 membraue of a species of Alga (Ectocarpus). 

 A, A young one-celled plant just after pene- 

 tration into the alga. B, Plant composed of 

 several cells in the wall of Ectocarpus. C, 

 Plant which has formed sporangia of swarm- 

 spores, one of which is discharged and 

 another is in the act. (After Wille.) 



