Pteridophyten. 93 



dium F'endleri var. paucipinnatum Donn. Sm. and known only from 

 Guatemala. The following new combinations are published: Loxo- 

 gyamme Salvinü (Hook.) Maxon; Grammitis Salvinii Hook., Gymno- 

 gramme Salvinü Hook.; Dryopteris formosa (Fee) Maxon {Aspidium 

 formosum Fee); Dryopteris longicandata (Liebm.) Maxon {Polypodium 

 longicaudatum Liebm.); and Poikilopteris Donnell-Smithii (Christ.) 

 Maxon [Gymnopteris Donnell-Smithii Christ.). Elaphoglossiim Hooke- 

 rianum Underwood is a new name here proposed as a Substitute 

 for Acrostichum muscosum Jenman, not Swartz; the grounds for 

 the misidentification of the Swartzian species are indicated. 



II. The bipinnate species of Cyathea. — A key is given to 

 the bipinnate species of Cyathea of the American tropics, 5 in num- 

 ber, of which one is described as new, Cyathea Brooksii Maxon, 

 from eastern Cuba, the type and only material known being Maxon 

 4474. This species is somewhat related to C. minor D. C. Eaton, but 

 differs in many characters, notably in having the caudex short, hori- 

 zontal and mostly subterranean, in having the fronds long-stipitate, 

 and the segments mostly stalked. 



III. A revision of the West Indian species of Polysti- 

 chum. — Additional characters in determining the species of the 

 genus are pointed out as follows: „1. The presence or absence of a 

 proliferous bud upon the rachis; and 2. the position of this, whether 

 a. terminal at the truncate or retuse apex, b. borne some distance 

 below the foliose apex, or c, as is often the case, at the end of a 

 cirrhate or flagelliform Prolongation of the rachis." These characters 

 appear to be fixed, and the Utility of certain of them is pointed out. 

 In all 19 species are recognized, of which number the following 

 are here described as new: Polystichnm decoratnm Maxon, known 

 only from eastern Cuba, the type being Maxon 4408; P. dissimu- 



l ans Maxon, known only from Jamaica, the type being Maxon 

 1491; P. longipes Maxon, known only from Cuba, the type being 

 Wright 3924; P. Underwoodii Maxon, known only from Jamaica, 

 the type being Underwood 1441. P. dissimulans is the species to 

 which Jenman in error applied the name viviparum which was 

 given by Fee to an endemic Cuban plant recently rediscovered by 

 the writer; the differences are pointed out; the proper name for the 

 Cuban species is P. heterolepis Fee. P. Harrisii Maxon is a new 

 name given to a Jamaican species described as Aspidium caudatum 

 by Jenman (not A. caudatum Sw.). Aspidium Christianae Jenman 

 is transferred to Polystichnm as P. Christianae (Jenman) Underw. & 

 Maxon. Polystichnm Struthionis Maxon is a new name given to 

 Aspidium mucronatum Hook, (not Sw., 1801), Polystichnm echinatum 

 C. Chr. (not Polypodium echinatum Gmelin); and the grounds for 

 the previous misidentification are given. The species first described 

 as Phegopteris polystichiformis Fee and more recently as Polysti- 

 chnm tenue Gilbert becomes Polystichnm polystichiformis (Fee) Maxon; 

 it is apparently confined to Cuba and Jamaica. The Jamaican plant 

 described as Aspidium viviparum rhisophorum Jenman is given 

 "specific rank as Polystichum rhisophorum (Jenman) Maxon. The new 

 species and several of the older ones are figured , and the relationship 

 and distribution of all are discussed. A key is provided. 



IV. Descriptions of new species. — These are: Asplenium 

 Palmeri Maxon, from Mexico and Guatemala, the type being 

 Rose & Painter 7582, the species being allied to A. Trichomanes, 

 but distinguished by having the fronds proliferous at the elongate 

 naked apex; Cyathea crassa Maxon, from Santo Domingo, Eggers 



