(64) 



Christensen, C. On a natural classification of the species of Dryopteris. 



^Biol. Arbejder tilegn. Eug. Warming. Kgbenhavn, Hagerup [1911], p. 73—86.) 

 -^ Revision of the American species of Dryopteris of the group of D. opposita. 



(Danske Vid. Selsk. Skr. VII Nat. 4, [1907]. p. 249—386.) 



— Two new bipinwatifid species of Alsophila. (Fedde, Repertorium X [1911], 

 p. 213—214.) 



Clute, W N. The perplexing forms of Botrychium, and especially the question 

 of B. simplex, the rarity of which has caused much misunderstanding. (Fern 

 Bull. XIX 1911, p. 11—14, Fig.) 



— Dicksonia pilosiuscula f. Poyseri, a beautiful fern found in Maine in 1907 by 

 H W. Merrill. (Fern. Bull. XIX 1911, p. 7—8 Fig.) 



— The distribution of Asplenium alternans. (Fern. Bull. XIX [1911], p. 38—42.) 



— Hemigramma latifolia. (Ibidem XIX [1911], p. 46—48. Illustr.) 



— Pteridographia. (Ibidem XIX, p. 53—56.) 



— Rare forms of ferns. XVIII. (Ibidem XIX, p. 50—52. Illustr.) 



— A Figure and description of Asplenium Andrewsii Nels., a Colorado fern. 

 (Fern. Bull. XIX 1911, p. 3—4, 1 pi.) 



Copeland, E. B. New Ferns from Sibuyan. (Leaflets of Phihppine Botany 



IV Art. 61 [1911], p. 1149—1152.) 

 Cossmann, H. Deutsche Flora, IV. Autt. in zwei Teilen, Breslau 1911, 448, 



XXIX pp., 706 Abbild.) 



Crane, D. B. Planting Hardy Ferns. (The Garden LXXV [1911], p. 537. 111.) 



— Maidenhair Fern. (The Garden LXXV [1911], p. 587.) 



Dummer, R. Grape sugar as an excretion in Platycerium, (Ann. of Bot. XXV 

 [1911], p. 1205-1206.) 



Ferris, I. H. The finding of Asplenium alternans. (Fern. Bull. XIX [1911] 

 p. 36—38.) 



Fischer, K. Nephrolepis duplex Jank und Nephrolepis davallivides van furcans. 



(Gartenwelt XV [1911], p. 673—674. Mit 2 Textabbildungen.) 

 G. Asplenium Nidus-Avis. (Revue de I'Hortic. Beige et Etrangere [1911], No. 24 



p. 393— 394. Mit Tafcl.) 



Gyorffy, I. Scolopendrium vulgare L. in der Hohen Tatra. (Ungar. Bot. Blatter X 

 19U, p. 345—346.) 



Ha. A. T. Tasmanian Tree Ferns. (The Garden LXXV [1911], p. 527.) 

 (Dicksonia antarctica.) 



Halft, F. Die Schliefihaut der Hoftupfel im Xylem der Gefafikryptogamen. 

 (Dissert. Bonn 1910.) 



Halle, Thore, G. On the Fructifications of Jurassic Fern- leaves of the 

 Cladophlebis denticulata-type. (Arkiv for Botanik X [1911], No. 15 p. 1—9, pi. 1—2.) 



Hamshaw, Thomas, H. On the leaves of Calamites (Calmocladeis section). 

 (Phil. Trans. Roy. Soc. London B. 202 [1911], p. 51—92, pis, 3—5.) 



Hannig, E. Uber das Vorkommen von Perisporien bei den Filicinen nebst 

 Bemerkungen uber die systematische Bedeutung dersclbcn. (Flora CIH [1911]. 

 p. 321—346, 8 Textfig.) 



Hayata, B. Sur une espcce nouvelle de Fougtrc du genre Drymotacmum 

 de Formosc. (Bull. Soc. Bot. France LVIII [1911], p. 563—566. PL ^I^' 

 1 Fig. d. I. texte.) 



Heath, F. G. British Ferns. Pocket-help for the collector. (London 1911; 12". 



. 140 pp. wMth figures.) 



Heydt, Adam. Adiantum scutum roseum, ein wertvoller ncuer Farn. (Garten- 

 welt XV 1911, p. 538.) 



Hieronymus, G. Species novae Selaginellarum philippinensium. (Fcdde, Rep- 

 spec, vov. X ;i911], p. 41—53, 97—116.) 



