26 Pflanzenkrankheiten. — Pteridophyten. 



meteorologischen Daten und vor allem ein ausführliches Inhalts- 

 verzeichnis, das das Auffinden der wichtigsten Krankheiten schnell 

 ermöglicht. H. Klenke (Oldenburg i. Gr.). 



Maxon, W. R., Studies of tropical american ferns. VI. 

 Contr. U. S. nation. Herb. XVII. p. 541-608. 1916.) 



The present number of the writers series about studies of tro- 

 pical american ferns is devoted mainly to a consideration of three 

 groups of Polypodmm, whose species have for the most part been 

 greatly misunderstood, viz. P. trichomanoides, P. furfuraceum and 

 P. squamaturn each with its allies. A key to the species in each 

 group is given and a list of the species, belonging to each group, 

 follows, in which s5''nonymy, type locality, distribution, Illustration 

 are discussed. The group of Polypodiiint trichomanoides contains as 

 species: P. micropteris C.Chr., P. limula Christ, P. hartii ]enma.n, 

 P. nutatuni Jenman, P. cookii Underw. et Maxon, P. wilUmnsii 

 Maxon nov. spec, P. caucanum Hieron., P. grisebachii Underw., 

 P. perpusilluin Maxon, P. mitchellae Baker, P. shaferi Maxon, P. 

 schenckii Hieron.. P. organense (Gardn.) Mett., P. trichomanoides 

 Swartz. P. serricula Fee, P. basiattenuatiim Jenman, P. shervingii 

 Baker, P. andinum Hook., P. truncicola Klotzsch, P. nantim Fee, 

 P. daguense Hieron., P. hyalinum Maxon, P. setulosum Rosen st., P. 

 nimbatum Jenman, P. blepharodes Maxon, P. taenifolium Jenman, 

 .'ind as doubtful or excluded species: P. atitioguianum Baker, P. ble- 

 pharolepis C.Chr., P. gibbosum Fee and P. undulatiini Fourn. 



As related to P. furfuraceum are mentioned : P. furfuraceum 

 Schlecht, et Cham., P. cryptocarpon Fee, P. platylepis Mett., P. 

 lindenianum Kunze, P. friedrichsthalianum Kunze, P. fallax Schlecht. 

 et Cham., P. xnntholepis Harrington, P. subvestitum Maxon nov. 

 spec, P. fallacissimum Maxon nov. spec, P. typicum Fee, P. bryo- 

 podum Maxon nov. spec, P. pycnocarpum C. Chr., P. moUendense 

 Maxon, P. rusbyi Maxon nov. spec, P. murorum Hook, P. leucostic- 

 ton Kunze, P. plebejurn Schlecht, et Cham., P. tweedianum Hook., 

 P. guttatum Maxon nov. spec, P. onlolepis F^e and P. monosorum 

 Desv., and as doubtful species P. aturense Maury, P. balliviani 

 Rosenst., P. buchtienii Christ, et Rosenst., P. fraseri Mett., P. masa- 

 fuerae Phil., P. nigripes Hook., P. platybasis Baker, P. pleopeltidis 

 Pee, P. segregatum Baker and P. tuerckheimii Christ. 



The third group, that of P. squamatum and its allies contains: 

 P. myriolepis Christ., P. sanctaerosae (Maxon) C. Chr., P. collinsii 

 Maxon nov. spec, P. macrolepis Maxon nov. spec, P. polypodioides 

 fL.) Hitchc, P. thyssanolepis A. Br., P. argentinum Maxon nov. spec, 

 P. leucorosporum Klotzsch, P. tridens Kunze, P. lepidotrichurn (Fee) 

 Maxon, P. lepidopteris (Langsd. et Fisch.) Kunze, P bombycinuyn 

 Maxon nov. spec, P. balaonense Hieron., P. pyrrholepis {F€e) Maxon, 

 P. rosei Maxon nov. spec. P. squamatum L., P. fimbriatum Maxon 

 nom. nov. (= P. viUosum Karst.); as doubtful species of this group 

 P. lanosum Fee, P. longicaule (Föe) C. Chr. and P. vexillare Christ, 

 are mentioned. 



Some other new species of Polypodium are described: P. flexuo- 

 sutn Maxon nov. spec, P. chiricanujn Maxon nov. spec, P. crassu- 

 lum Maxon nov. spec, P. mibigenum Maxon nov. spec. and P. pal- 

 yneri Maxon nov. spec. ; than foUow some notes relating to several 

 species of Notholaena, which have been generally misunderstood or 

 misidentitied in recent 3'-ears, viz.: Notholaena cretacea Liebm., N. 



