CROXARTIL'M. 



383 



and curl up. In some districts very common. Aecidial stage 

 unknown. 



Gymnosporangium.^ 



Teleutospores bicellular and furni.slied with stalks which have 

 gelatinous walls, so that the spores come to form part of a 

 gelatinous mass.^ The first-formed teleutospores are thick - 



Fig. 21G.— &>)„«os;)o, 

 the spore-cjishions. 4, 

 others are thick-coated. 



iian clo.riiiuiiifoi-iiii. 1, J, ■:. M.i-i - m .u v. h.|.in.-nt of 

 . Isolated spores (enlarged); ■', is thin-coated, the 

 Germinating .?pore with proniyceliuin abjointing 



sporidia (.S). 9, A germinating sporidiuui. (After Tubeuf.) 



walled, the succeeding ones are tliin- walled. Uredospores do 

 not occur. The aecidia have a thick peridium. The teleuto- 



^ V. Tubeuf: (1) CentraUilaft f. Baiter, k. J'arasidnkunth, 1S91 ; with a review 

 of the current Literature. (2) "Infectionen mit (iymnosporangium." ForMch- 

 natunviss. Zeitxrhrift, 1S93, p. 7r>. Woernle, " Anatomi.sche Untersuchungen d. 

 durch Gymnosporangium-Arten hervorgerufenen Missbildungen," idem., 1894. 

 Aniericaii Literature, see p. 40 L 



- The gelatinous substance is obviously well-adapted to absorb rain-water 

 and so facilitate germination of the teleutospores in situ ; the sporidia pro- 

 duced are then carried ofif by rain or liberated after the cushions dry again. 



