446 SUMMARY OF CUERENT RESEARCHES RELATING TO 



macrosporangium, but iu the microsporangium all the cells of the 

 sporogenous tissue divide up into tetrads ; and the author counted as 

 many as 1500 microspores in one sporangium. 



Apogamy in Pellaea and NotochlaBna,* — H, Wesselowska describes 

 in a preliminary note the main results of her studies of apogamy and 

 apospory in certain ferns, viz., species of FeUcBa and NotochUena. In 

 every case of apogamy observed the leaf was the first member produced, 

 and was followed by the cauline apical cell, and last of all by the root. 

 Certain deviations were obtiiined with N. fiavens when cultivated in 

 darkness. Experiments in regeneration were made upon the above 

 apogamous forms and on a normal species, Gyimiogramme farinifera, 

 resulting either in the production of new leaf -tissue or in a prothallium, 

 in other words, an artificial production of apospory. Sometimes a 

 bunch of rhizoids was formed at the leaf -apex. 



Ferns of Bornecf — H. Christ describes the ferns collected by 

 Nieuwenhuis and Hallier. He alludes to the physical geography of the 

 island, and divides the ferns of Borneo into four groups — endemic, 

 Malayan, Indo-Malayan, and generally distributed tropical species. The 

 result is 38 species new to the Borneo flora, and of these IG are new to 

 science ; the total fern-flora for Borneo is now 470 species. Among 

 these are 127 endemic species, 144 Malayan, lid Indo-Malayan, and 30 

 common to other tropics. 



North American Ferns. J — L. H. Pammel and C. M. King give an 

 annotated list of the vascular Cryptogams of Iowa and the adjoining 

 parts of south-eastern Minnesota and western "Wisconsin. This list 

 covers a wider area than that covered by Shimek in his list puljlished 

 one year previously. Short descriptions are given of the physical 

 geography of the district and of the plant-associations found in the 

 various situations. Some photographs of natural fern-growths are 

 added, and for each species a separate map of its distribution in the 

 whole area is given. 



L. S. Hopkins § publishes an annotated list of 62 ferns and fern- 

 allies recorded as occurring in Ohio. One of the localities visited 

 afforded as many as 20 species of ferns within a space of half-a-mile. 



"W. N. Clute II publishes short notes on IVicJwmanes reniforme from 

 Xew Zealand, on the occurrence of Asphnium innnatifidam in Con- 

 necticut, and on a rare cut-leafed form of Osmunda cinnamomea. Also 

 he issues a further contribution of his check-list of the North American 

 fern-worts. 



R. F. Griggs IT describes the diurnal rotation of the leaves of 

 3Iarsih'a. Not only do the leaves close upwards at night, but in 

 M. vestita at least they face east and west at sunrise and sunset respect- 

 ively, the mechanism of movement being located in the petiolules of 

 the leaflets. 



* Ber. Deutsch. Bot. Gesell., xxv. (1907) pp. 85-86. 

 t Ann. Jard. Bot. Buitenzorg, xx. (1905) pp. 92-140 (1 pL). 

 X Proc. Iowa Acad, of Sci., ix. (1902) pp. 134-50 (27 pis.). 

 § Fern Bulletin, xv. (1907) pp. 1-13. 

 II Tom. cit., pp. 14-24 (1 pi.). 

 \ Ohio Naturalist, vi. (1906) pp. 554-5. 



