200 Pteridophyten. 



Chambers, H. S., The Vestigial Axillary Strands of Tri- 

 chomanes javanicum, Bl. (Ann. Bot. p. 1037 — 1043. pl. 80. 5 Textfig. 

 1911.) 



Trichomanes javanicum has an erect unbranched stem and 

 bipinnate fronds; the stele consists of X3'lem mixed with paren- 

 chyma, the protoxylem being indistinguishable. This stele gives off 

 meristeles consisting of a solid mass of xylem mixed with paren- 

 chyma, surrounded by phloem, pericycle and endodermis. The 

 protoxylem is central and remains so until the meristele divides 

 into the petiolar Strands and the Strand of the axillary branch. The 

 leaf trace proper has at first its xylem arranged round two groups 

 of parenchyma, the thinner portion of the xylem being on the 

 flattened adaxial side; in the parenchyma are two protoxylems. 

 Later the parenchyma becomes aggregated into a Single group and 

 the trace becomes arched with a protoxylem at each incurved arm 

 of the metaxylem. In T. radicans the axillary branch develops nor- 

 mally and its vascular Strand is larger than the leaf trace; in T. 

 javanicum the axillary vascular Strand is smaller than the leaf trace 

 and dies out in a small parenchymatous protuberance on the adaxial 

 surface of the petiole. This is compared to the parenchymatous 

 mass projecting from the stele of Helminthostachys into the axillar}'" 

 canal. It is held that the Ophioglossaceae , Botryopterideae and Hy- 

 menophyllaceae are in one cycle of affinity. 



Isabel Browne (University College London). 





Christ, H., On Psomiocarpa, a neglected genus of ferns. 

 (Smiths. Mise. Coli. LVI. 23. p. 1-4. pl. 1. Nov. 21. 1911.) 



"The long discredited genus Psomiocarpa was established by 

 C. B. Presl on one of the most extraordinary plants of the Phi- 

 lippine Islands, first discovered by the late Cuming and named 

 by John Smith Polybotrya apiifolia. In conformity with our present 

 views of generic relationship within the Polypodiaceae this genus 

 must now be reinstated, leaving out Polybotrya acuminata Link and 

 P. incisa Link, which are true members of the genus Polybotria, 



and including 2 American plants characterized in the present 



paper". The 3 species recognized by the writer under Psomiocarpa 

 are: Psomiocarpa apiifolia (J. Sm.) Presl, confined to the Philip- 

 pine Islands; P. aspidioides (Griseb.) Christ, founded on Wright 

 1827 and known only from Cuba; and P. Maxoni Christ, sp. nov., 

 from Jamaica, the type being Maxon 2228, from the vicinity of 

 Holly Mount. The last species, which is similar to the Cuban, 

 is illustrated by a text figure and a plate. 



The paper concludes with notes on the phj^logenetic relationship 

 of the genus and the affinity to Dryopteris. Maxon. 



Christenseil, C, The tropical American species of Dry- 

 opteris subgenus Eudryopteris. (Amer. Fern Journ. I. p. 93 — 97. 

 Jury, 1911.) 



The writer recognises as distinet 10 species of Dryopteris, sub- 

 genus Eudryopteris, from tropical America. Of these the following 

 are described herein as new: D. Saffordii C. Chr., from the moun- 

 tains back of Lima, Peru, W. W. Safford 994, type; and D. 



