468 SCTMMARY OF CURRENT RESEARCHES RELATING TO 



to Hemigramma latifolia, Tectaria crenata, and some presumed hybrids 

 between the two, illustrating his remarks with photographs. 



The same author * publishes notes on the Steere Collection of 

 Philippine Ferns named by Harrington,! and corrects the erroneous 

 determinations. 



Copeland J also publishes a revision of Tectaria, with special regard 

 to the Philippine species. He defines the groups into which the species 

 fall, supplies a key to the 17 Philippine species, and adds descriptive 

 remarks to each of those species. 



Symbiosis in Fern Prothallia.§ — D. H. Campbell cites numerous 

 instances of symbiotic association of fungi with higher plants, and also 

 of Schizophycege with hepatics and other plants. The presence of 

 mycorhizal fungi in the roots of Cupuliferse, Orchidaceas, and Ericaceae, 

 and in a large number of diverse families, having been considered, more 

 particular attention is directed to the presence of similar endophytic 

 fungi in the prothallia of Pteridophytes — Ophioglossaceae, Lycopodiaceae, 

 Osmundaceaj, Marattiacese, and Gleicheniacese. The author describes 

 his own researches in connection with the last three families, describing 

 and figuring the structure of the endophyte. As to the significance of 

 the endophyte, the author points out that though an important part of 

 its functions is to supply nitrogen compounds to the host, another part 

 may be to supply carbon compounds directly or indirectly, especially 

 where the host is destitute of chlorophyll. The host having acquired 

 the habit of associating itself with the fungus, the gradual development 

 of such purely saprophytic subterranean gametophytes as those of 

 Ophioglossacese is readily conceivable. 



North American Fern-Hybrids of the Genus Dryopteris.|| — 

 P. Dowell gives an account of some new North American ferns which 

 he describes as hybrids of the genus Dryopteris. They are not referable 

 to any single recognised species, but have characteristics in common 

 with two known species ; they tend to be sterile, the sporangia being 

 largely abortive ; they occur only occasionally, and rarely in large 

 numbers in any one locality ; they grow in places favourable for the 

 mingling of the gametes and usually associated with the supposed parent 

 species. Four new hybrids are described, based on the parent species 

 D. Clintoniana, D. intermedia, D. Goldiana, D. marginalis . 



Anatomy of Sigillaria.il — E. A. N. Arber and H. H. Thomas give 

 an account of the structure of Sigillaria scutellata Brongn., and other 

 Eusigillarian stems, in comparison with those of other Palaeozoic 

 Lycopods. The chief material described came from the lower Coal 

 Measures of Shore-Littleborough in Lancashire, two well preserved 

 stems. These, and other specimens alluded to, belong to species of the 

 Rhytidolepis section of the Eusigillariae. The medulla, protoxylem, 



* Philippine Journ. Soi., ii. (1907) pp. 405-7. 

 t Journ. Linn. Soc. Bot., xvi. (1877) p. 25. 

 X Philippine Journ. Soi., ii. (1907) pp. 409-18. 

 § Amer. Nat., xlii. (1908) pp. 154-65 (figs). 

 II Bull. Torrey Bot. Club, xxxv. (1908) pp. 135-40. 

 i Proc. Roy. Soc, ser. B, lxxx. (1908) pp. 148-50. 



