i 



I 



1907] CURRENT LITERATURE 69 



second supplement continues the literature of 1899-1904 in reference to dicoty- 

 ledons from Euphorbiaceae to Sapotaceae. — J. M. C. 



Flora of Winneshiek Co., Iowa, — Shiaiek' has published an account of the 

 plants of one of the counties of Iowa, prefacing the annotated list by a discussion 

 of the forest problem, ornamental plants, forage plants, weeds, and medicinal 

 plants.— J. M. C. 



Eucalyptus. — The eighth part of Maiden's^ revision of Eucalyptus contains 



the description, synonymy, range, and affinities of seven species. This series, 

 begun in 1903, now includes twenty-four species. — J. M. C. 



Das Pflanzenreich.9— Part 28 contains the group Calceolarieae of Scrophu- 

 lariaceae. The three genera are Porodittia (i sp.), Jovellana (6 spp.), and 

 Calceolaria (192 spp., with 9 new). — J. M. C. 



NOTES FOR STUDENTS 



Apogamy and apospory in ferns. — ^Professor FARifER and Miss Digby have 

 published'^ the results of their studies of apogamy and apospory in ferns. The 

 forms described are Lastrea pseudo-mas vars. polydactyla Wills, polydaciyla Dadds, 

 and cristata apospora Druery; Athyrium Filix-joemina vars. clarissima Jones, 

 clarissima Bolton, and uncoglomeratum Stansfield; and Scolopendriunt vulgare 

 var. crispum Drummoitdae. 



In Athyrmm Filix-joemina clarissima Jones there is no change in the number 

 of chromosomes in passing from the sporophyte to the gametophyte phase of the 

 life-history; and there is no migration of nuclei from one prothallial cell to another. 

 The embr}'o arises as a bud upon the gametophyte. 



In Athyrium Filix-joemina clarissima Bolton there is no reduction of chro- 

 mosomes, no true fertilization, no migration of prothallial nuclei, and the embryo 

 develops from an unfertilized egg. 



In Athyrium Filix-joemina uncoglomeratum Stansfield the embryo arises in 

 connection with an archegonlum, but details were not discovered. The number 

 of chromosomes (about 100) is maintained throughout the life-history and there 

 is no migration of prothallial nuclei. 



In Scolopendrium vulgare crispum Drummondae a remarkable condition is 

 described. The number of chromosomes in sporophyte nuclei is about 100, 

 in prothallial nuclei about 70, in archegonial nuclei about 80, and in antheridial 



7 SanvtEK, B., Flora of Winneshiek County. Iowa Geo!. Surv. 16: 147-211. 1906. 



^ Maiden, J. H., A critical revision of the genus Eucalyptus. Part \1II. pp. 211- 

 254. pis, 37-40, Sydney: Published by State of New South Wales. 1907. 2s. 6d. 



9 Engler, a., Das Pflanzenreich. Heft 28. Scrophulariaceae Antirrhinoideae- 

 CalceolarieaevonFr. Kranzlin. pp.128, figs. 21 {142). Leipzig: Wilhelm Engelmann. 

 1907- *V64o. - 



'° Farmer, J. Bretland, and L. Digby, Studies in ap<jgamy and ap.>spory in 

 ferns. Annals of Botany 21:161-199. pis. 16-20. 1907. 



