ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 201 



upon E. B. Copeland's paper on the comparative ecology of San Ramon 

 Polypodiacere in the Philippine Islands, suggesting the relation between 

 morphology and environment in numerous details. The same author* 

 publishes a portion of his check-list of the North American Fernworts, 

 comprising species 167-211, Polypodium to Woodwardia. M. Slosson f 

 publishes notes on some hybrid ferns. Speaking of Dryopteris cristata x 

 marginalis, she speculates as to why, in the great majority of the hybrids, 

 the root-stock should be upright, as in I), marginalis, rather than 

 creeping, as in D. cristata. The half-evergreen leaves of the hybrid 

 last longer into the winter than do those of D. cristata, but not so lon^ 

 as those of D. marginalis. The number of recorded American hybrids 

 is rapidly increasing. For instance, in Dryopteris there are at least six 

 species which intercross, whence fifteen hybrids are possible. Nine of 

 these have been recorded ; four more are about to be published ; and 

 the remaining two are confidently expected. W. N. Clute % gives a 

 figure and description of Polypodium gramineum, an epiphytic fern 

 abundant in the elevated parts of Jamaica. G. T. Cleveland § gives an 

 account of the ferns of the Upper Susquehanna valley, prefaced by 

 some notes on the physical geography of the district. The rarer ferns 

 only are enumerated, and these amount to thirteen species. J. C. 

 Buchheister || describes the natural habit of Nephrodium simulatum 

 when growing wild, and points out how it differs from N. eboracense 

 and N. thelgpteris. He wonders whether it can possibly be a hybrid of 

 these two species. A. N. Rood If describes a habitat of Lycopodium 

 lucidulum var. poropkilum in Ohio. The plant itself was at first mistaken 

 for L. Selago, a species which does not occur so far south. W. N. Clute ** 

 describes and figures Osmunda cinnamomm f. cornucopia folia, a new 

 abnormal form found in Ohio, characterised by the rachis of the pinnae 

 being denuded above the middle, but bearing a small, apical group of 

 pinnules ; again, several of the lower pinnules bear a stalked ascidium 

 terminating a veinlet which arises from the middle of the underside of 

 the pinnule. He also writes an obituary notice of the late Alvah A. 

 Eaton, ft a well-known American pteridologist, who died last September 

 aged 43. S. H. Burnham %\ gives an account of Asplenium ebenoides 

 as grown under cultivation. It is a hybrid of Asplenium platyneuron 

 and Camptosorus rhizophyllus, and occurs in limestone pockets in 

 company with the two parent species. While resembling the first parent 

 in general appearance, it retains the tapering rooting fronds of the 

 second parent. It thus propagates itself by plantlets arising from its 

 rooting apices. C. C. Plitt §§ publishes some notes on Equisetum hyemale, 

 and shows (1) that the species has two periods of spore-shedding — one 

 during the latter half of April from the bursting of the sporangia 

 formed after the middle of July in the preceding year : and the other 

 during the first half of July from the sporangia born on the newly 



* Fern Bulletin, xv. (1907) p. 120-7. 



t Op. cit., xvi. (1908) pp. 97-9. J Tom. cit., pp. 99-101 (pi.). 



§ Tom. cit., pp. 101-3. II Tom. cit., pp. 104-5. 



i Tom. cit., pp. 105-6. ** Tom. cit., pp. 107-9. 



tt Tom. cit., pp. 109-11. XX Tom. cit., pp. 111-13. 

 §§ Tom. cit., pp. 113-16. 



April 21st, 1909 p 



