﻿1903] RAVENELIAS OF THE UNITED STATES 1 33 



All three stages have been repeatedly found by the writer on the same 

 trees, the aecidial stage first and the other stages appearing in due time. 

 Occasionally an old dead gall will continue on the trees till the next spring. 

 The descriptions were all drawn from material collected at Austin, Texas. 



There is some doubt in the writer's mind about this species being iden- 

 tical with the old Ravenelia Holwayi, as there are several minor differences, 

 but none apparently of sufficient value to separate it from R. Holwayi Diet. 

 The aecidial stage being of the caeoma type throws it into a new genus. 



Denton, Texas. 



EXPLANATION OF PLATES II AND III. 



All figures except 24a and 24b are magnified, after reduction, 400 times; 24a, as 

 indicated on plate and 24h are magnified 80 times. 



Fig. I. Ravendia texana: a^ teleutospore head; 3, uredospores ; c, paraphyses. 



Fig, 2. Raveneha Longiana: a^ teleutospore head; ^, uredospores; <r, paraphyses. 



Fig. 3. Ravenelia versaiilis: a, teleutospore head ; b^ uredospores ; c, paraphyses. 



Fig. 4. Ravenelia indica: a, teleutospore head; b, uredospores; e, cysts; d, 

 simple teleutospore. 



^iG- $. Ravenelia opaca: a^ teleutospore head; b, three teleutospores and 



pedicel. 



I*IG. 6. Ravenelia Farlowiana: teleutospore head. 



Fig. 7. Ravenelia siliquae: a, uredospores ; ^, paraphyses. 



Fig. 8. Ravenelia appendiculata : a^ teleutospore head; ^, uredospores ; r, para- 

 physes. 



Fig. 9. Ravenelia verrucosa: a, teleutospore head ; b, uredospores ; c, paraphyses. 

 Fig. 10. Ravenelia expansa: di, teleutospore head ; .5, uredospores ; r, paraphyses. 

 Fig. II. Ravenelia mimosae-sensitivae : a, teleutospore head; b, uredospores; r, 

 paraphyses. 



Fig. 12, Ravenelia cassiaecola: a, teleutospore head; b, uredospores. 



I*IG. 13. Ravenelia mesillana: a^ teleutospore head; b, uredospores. 



Fig. 14. Ravenelia fragrans: di, teleutospore head; b, uredospores; ^, common 

 or typical paraphyses ; d^ uncommon forms of paraphyses. 



Fig. 15, Ravenelia spinuhsa: a, teleutospore head; (5, uredospores ; Cy paraphyses. 



Fig. 16. Ravenelia arizonica: a, teleutospore head; b, uredospores; c, typical 

 form of paraphyses; d, cystoid paraphysis. 



Fig. 17. Pleoravenelia laevis: rz, teleutospore head ; ^, uredospores ; c^ paraphy- 

 ses; t/, teleutospore. 



Fig. 18, Pleoravenelia epiphylla: a^\.t\tvXo^l^OT^\xt'^A\ /&, uredospores ; tr, paraphy- 

 ses; //, teleutospore. 



Fig. 20. Pleoravenelia brogniartiae : a, teleutospore head; b, uredospores; ir, 

 teleutospore. 



Fig. 21, Pleoravenelia similis : a, teleutospore head; b, uredospores. 



Fig. 22, Pleoravenelia talpa: a, teleutospore head; b, uredospores. 



Fig. 23. Ravenelia leiicaenae: a, teleutospore head ; b, uredospores ; c, paraphyses. 



Fig. 24. P/eo ravenelia Holwayi: a, galls with aecidiosori on them ; b, an aecidio- 

 sorus and one spermogonium ; c, aecidiospores; d. teleutospore head; e, uredo- 

 spores ; /, paraphyses. 



Fig. 25. Ravenelia mexicana: a, teleutospore head ; b, uredospores ; c, paraphyses. 



+ ^ J- 



