The Philippine Journal op Science, C. Botany. 

 Vol. XI, No. 4, August, 1916. 



HAWAIIAN FERNS COLLECTED BY J. F. ROCK 



By Edwin Bingham Copeland 

 (From the College of Agriculture, University of the Philippines, Los 



Banos, P. I.) 



Through the courtesy of Mr. J. F. Rock of the College of 

 Hawaii, I have recently had an opportunity to study the ferns of 

 the College of Hawaii herbarium, and have found among them 

 the following apparently undescribed species. In some groups, 

 especially Polypodium, this collection is notably richer than 

 Faurie's, 1 while in other, such as Asplenium, it is not so com- 

 plete. All the specimens here described were collected by Mr. 

 Rock. 



ATHYRIUM PSEUDOARBOREUM sp. nov. 



Asplenium arbor eum Hilleb. non Willd. quid Athyrium arboreum 

 Milde. 



A. arboreo (Willd.) Milde similis, sed paleis brunneis latio- 

 ribus prope baseos stipitum, soris longis marginem fere attingen- 

 tibus, et indusiis latis versus margines suas albidis distinctum, 

 et propter eas indicationes versimiliter phylogenetice diversum. 



Lanai, Mahana Valley, in shady, damp places, altitude 770 meters. Rock 

 8081. 



There is no question that this is the Asplenium arboreum of Hillebrand, 

 page 609, who modified the description, as regards the sori, to fit this 

 fern. But much as the two are superficially alike, Asplenium arboreum is 

 a clear-cut member of an American group of species, while Athyrium 

 pseudoarboreum represents the Oriental group of Athyrium japonicum. 

 Athyrium kaalaanum Copel. 1 is also one of this group, but I do not 

 believe it is a juvenile or reduced form of Athyrium pseudoarboreum; it 

 has fleshy stipes, a long apex, obtuse pinnae, and short sori. Except for 

 acuminate pinnae and the absence of a gemma, Athyrium pseudoarboreum 

 fits Presl's diagnosis of Diplazium sandwichense, and I would be tempted 

 to use this name if Asplenium sandwichianum were not already in use. 



SADLERIA RIGIDA sp. nov. 



Caudice ignoto; stipitibus ca. 15 cm longis, validis, ubique 

 densissime paleatis ; paleis linearibus, rigidulis, crinitis, rufocas- 

 taneis costa spuria castanea, infimis 3 cm longis pallidioribus, 

 sursum usque ad rachides secondarias etenim ad costulas decres- 

 centibus, ibidem costa carentibus; fronde elliptica vel ovata, 

 ca. 33 cm longa, 20-25 cm lata, abrupte acuminata, rhachi dense 



■ Philip. Journ. Sci. 9 (1914) Bot. 435. 

 s Op. cit. 438. 



171 



