APPENDIX. 



As an appendix to the above revision I give here diagnoses of two new 

 species, which do not belong to the group of D. opposita, although their lower 

 pinnæ are somewhat reduced. In my opinion they belong to the group of D. patens 

 and D. parasitica. Dr. H. Christ has kindly sent me the following diagnosis of 

 D. urens, which I publish with pleasure here, because the species is furnished with 

 burning hairs, a peculiarity unknown before within the class of Pteridophyta. 



After having written the above and after having forwarded my manuscript to 

 the printer I have received from Dr. Rosenstock a diagnosis of a new species, 

 Dryopteris urens Ros., from Uruguay, Punla Hallena, leg. Arechavaleta. Comparing 

 his description with that of Dr. Christ published here I have no doubl, that 

 Rosenstock's D. urens is quite the same species, and the name must then, of course, 

 be attributed to him. 



Dryopteris urens Rosenstock in Fedde: Repertorium 4: 5. 1907 — [Fig. 52 I]. 



Uruguay, lat. Atlant., prope Punta Ballenas in arenis humidis, leg. Mariano 

 B. Berro 2. Jan. 1907 (HC). 



Ampla, ultra 80 cent, longa, rhizomate stipite longo, 3 ad 4 mill. 



crasso, cum rachi luteo-viridi, pilis albidis flexuosis 1 mill, longis dense vestito, 

 sicce anguloso. Fronde ovato-oblonga, 80 cent, longa, 20 cent, lata, acuminata, 

 versus basin subito in auriculas aliquot oblongas acuminatas et laciniatas 3 cent, 

 longas contracta, bipinnatisecta, pinnis inferioribus remotis oppositis, caeteris alternis 

 et confertis, ca. 40 utrinque, erecto-patentibus, usque ad 17 cent, longis, 23 mill, 

 latis, sessilibus, insertione subcallosa, ligulato-lanceolatis, acuminato-caudatis, basi 

 subdilatatis, i. e. segmento anteriore aucto et inlerdum laciniatis, costa viridi sub- 

 flexuosa basi 1 mill, crassa ; pinnis ad basin usque ad costam, caeterum usque ad 

 alam utrinque 1 aut 1';:; mm. latam incisis. Segmentis ligulato-oblongis ca. 50 

 utrinque, pectinato-confertis, sinu acutissimo et fere nuUo separatis, 1 cent, longis, 

 basi BVa mill, latis, subfalcatis subacutis integris. Nervis inconspicuis liberis sim- 

 plicibus 10 ad 12 utrinque, obliquis, marginem altingentibus, infimis saepe in sinum 

 convergentibus. — Soris 8 ad 10 utrinque, inediis, spatium inter costulam margi- 

 nemque occupanlibus, contiguis nee confluentibus, rotundis 1 mill, latis dilute brun- 

 neis, indusio minuto mox evanido ciliato. Sporangiis glabris. — Costis costulis 



