Uredinacese, Ravenelia. 741 



18. Ravenella mimosicola Arth., North Amer. Fl. VII (1907) p 137. 2807 



— Pycnidiis ignotis; uredosoris amphigenis. numerosis, sparsis v. 

 in greges ciroinatim dispositis, rotundatis, parvis, 0,3-0,8 mm. 

 diam., subcuticularibus, mox nudis, cinnamomeo-brunneis; para- 

 physibus numerosis intermixtis, capitatis v, clavato-capitatis, par- 

 vis, 40-55 V 8-12, levibus, tunica supra crassiore, cinnamomeo- 

 brunnea, subtus pallidiore, stipite solido circulari ; uredosporis late 

 ellipsoideis v. leniter obovatis, parvis 18-22* 13-16, tunica pallide 

 cinnamomeo-brunnea, tenui. 1 |j-., crebre et minute echinulato- 

 verruculosa, poris germinativis 6-10, sparsis; teleutosporis amphi- 

 genis, numerosis, sparsis, irregularibus, usque 1 mm. diam., sub- 

 cuticularibus, mox nudis, theobromino-brunnei.s, nitidis; paraphy- 

 sibus nullis; teleutosporis supra castaneo-brunneis, 5-7-cellularibus, 

 60-80 ;j.. diam., quaque spora 5-7 seriebus papillarum semihyali- 

 narum 1-4 [x. long., prfedita; cystibus ovato-oblongis, udis tume- 

 scentibus disrumpentibusque; pedicello h^^alino, brevi, deciduo. 



Hab. in foliis Mimosna polyanthoidis et M. stipitatae 

 in Mexico. 



19. Ravenelia gracilis Arthur, Bot. Gaz. vol. XXXIX (1905) p. 393; 2808 

 North Amer. FI. VII (1907) p. 135. — Pycnidiis amphigenis. in 

 parvos greges confertis, punctiformibus, prominentibus, fuscis, sub- 

 cuticularibus, hemisph,Tericis, 60-100 \y. latis; uredosoris epiphyllis, 

 sparsis, parvis, usque ad 0,25 mm. diam., rotundatis, mamillatis, 

 subepidermicis, centro irregulariter dehiscentibus, subcupulatis; 

 paraphysibus numerosis intermixtis v. periph;T^ricis, cylindraceis, 

 40-60 » 7-10, subcontortis, tunica levi, tenui, hyalina v. subhya- 

 lina; uredosporis ellipsoideis vel obovato-oblongis, 30-40 » 16-21, 

 tunica 1,5-2,5 a. cr., brunneo-aurata, icqualiter et crasse ochinata, 

 poris 4-6 icquatorialibus pr;iedita; teleutosoris epiphyllis. sparsis, 

 parvis, paraphydibus destitutis, subepidermicis; t^Ieutosporis apice 

 castaneo-brunneis, 5-7-ceIIuIaribns, 75-100 a. diam , quaque spora 



4-7 seriebus tuberculorum subhyalinorum 3-4 a. alt. pr.rdita; 

 cystibus delicatis, apice adpressis, lateraliter confertis; pedicello 

 hyalino, brevi, deciduo. 



Ilab. in foliis Mimosacese indeterininat;i' in Mexico. 



20. Ravenelia bahiensis P. Hcnn., Hedwigia XLVII (1908i p. 267 2809 



— Soris teleutosporiferis longe eifusis, ramulos juniores defor- 

 mantibus, atris confluentibus; capitulis teloutosporarum subhemi- 

 spbericis, castaneis, 40-60 ;j.., e 5-8 sporis simpliribus subgloboso- 

 angulatis v. conoideis, 18-23 « 15-20 corapositis, collulas cystoideas 



