REED: SPECIALIZATION OF PARASITIC FUNGI SHA 
H. orygalus, H. strumosus nor H. tuberosus; (3) teleutospores from 
H. laetiflorus infected H. annuus, H. divaricatus, H. Kellermani, H. 
laetiflorus, H. mollis, H. occidentalis and H. tomentosus, but not H. 
grosse-serratus, H. hirsutus, H. orygalus, H. strumosus, nor H. tuberosus. 
About the only conclusion that one can draw is that H. annuus 
and H. tomentosus are readily infected with teleutospores from a variety 
of hosts. The evidence for distinct specialized races is not very clear. 
Tranzschel (158) states that he was able to infect Helianthus annuus 
with teleutospores from Xanthium strumarium; the aecidiospores 
produced on Helianthus annuus infected both HH. annuus and Xan- 
thium strumarium. 
Puccinia Hieracii (Schum.) Mart. Jacky (64) first investigated 
this rust and found some evidence for specialization, distinguishing 
one race on Hieracium villosum and suggesting the possibility of several 
others. Probst (113), more recently, has studied the rust and has 
come to the conclusion that there are two subspecies, each with several 
specialized races. He arranges the forms as follows: 
1. Puccinia Piloselloidarum Probst. 
. Hoppeani on Hieracium hoppeanum. 
. Peleteriani on Mieracium peleterianum. 
Pilosellae (a) on Hieracium pilosella. 
Pilosellae (b) on Hieracium pilosella. 
Velutint on Mieracium pilosella velutinum. 
Auriculae on Mieracium auricula and H. peleterianum. 
Floretini on Hieracium florentinum var. obscurum. 
Ziziant on Hieracium bauhini, H. florentinum var. alethes, 
H. pratense and H. zizianum. 
2. Puccinia Hieracit. 
a. Silvatict on Hieracium glaucum, H. humile, H. ochroleucum, 
H. pictum, H. silvaticum and H. trebevicianum. 
b. Silvatici pleiotricht on Hieracium silvaticum var. pleiotrichum. 
c. Stuvatict gentili on Hieracium folcanum and H. intybaceum. 
d. Schmidt on Hieracium Schmidtii, H. humile and H. ochro- 
leucum. 
e. Cinerascentis on Hieracium cinerascens and H. ochroleucum. 
Puccinia Leontodontis Jacky. Probst (112) states that three 
specialized races occur in this rust: 
1. Hispidi on Leontodon hispidus. 
2. Autumnalis on Leontodon autumnalis. 
3. Pyrenaict on Leontodon pyrenaicus. 
Puccinia petroselini (DC.) Lindr. Semadeni (139, 140) dis- 
tinguishes two specialized races of this rust, one on Aethusa cynapium 
and the other on Petroselinum sativum. 
Tene Ro v8 
