248 Pteridophyten. — Floristik etc. 



Michx.), H. prealta (E. prealtum Raf.), H. prealta affinis (E. robus, 

 tum affine Engelm.), H. prealta Suksdorfi (E. hiemale Suksdorfi A. 

 A. Eaton), H. prealta intermedia (E. hiemale intermedia A. A. Eaton)- 

 H. prealta scabrella (E. laevigatum scabrellum Engelm.), H. laevi- 

 gata (E. laevigatum A. Br.), H. laevigata Eatonii (E. hiemale inter- 

 medium p. p., A. A. Eaton), H. laevigatum Funstoni (E. Funstoni 

 A. A. Eaton), H. laevigata polystachya (E. Funstoni polystachyum 

 A. A. Eaton), and H. Nelsoni (E. variegatum Nelsoni A. A. Eaton). 



Trelease. 



Fernald, M. L„ Some North American representatives 

 of Braya humilis. (Rhodora. XX. p. 201—203. Dec. 1918.) 



Contains as new: Braya Richardsonii (Pilosella Richardsonii 

 Rydberg). Trelease. 



Fernald, M. L., The American representatives of Equise- 

 tum sylvaticum. (Rhodora. XX. p. 129— 131. July 1918.) 



Contains as new: Equisetum sylvaticum var. pauciramosum f. 

 multiramosum. Trelease. 



Adams, J. F., Keithia on Chamaecyparis thyoides. (Torreva. VIII. 

 [18]. p. 157—160. f. 1—2. Aug. 1918.) 



Contains as new: Keithia Chamaecyparissi. Trelease. 



Brown, W. H., The rate ofgrowth of Podocarpus imbricatus 

 atthe top ofMountBanahao, Luzon, Philippine Islands. 

 (Philippine Journ. Sc. C. Bot. XII. p. 317—329, PI. 17, 2 Fig. 1917.) 



The author brings some details on the occurrence of Podocarpus 

 imbricatus Bl. in general and especially on the Mount Banahao. 

 The Vegetation of that mountain is described and climate, rainfall 

 and temperature are tabulated. The rate of growth of Podocarpus 

 can only be determined by making periodical measurements of the 

 girth of the same trunks, as no annual growth rings have been 

 observed in the wood. P. imbricatus at the top of Mount Banahao 

 shows a very slow rate of growth, a tree 60 centimeters in diameter 

 being about 500 years old. The rate of growth is very much slower 

 than that of dominant trees at lower elevations in the Philippines 

 and of pines in the United States. Jongmans. 



Brown, W. H., E. D. Merrill and H. S. Yates. The re Vege- 

 tation of Volcano Island, Luzon, Philippine Islands, 

 since the eruption of Taal Volcano in 1911. (Philippine 

 Journ. Sc. C. Botany, XII. p. 177—248. 16 PL, 2 Textfig. 1917.) 



The paper contains a general description of Volcano Island 

 and of its former Vegetation. In the year 1911 the Vegetation has 

 been destructed almost totally by an eruption. The new Vegetation 

 is described in details and compared with Krakatau, and special 

 attention is paid to the distribution of the species and their method 

 of distribution. The end of the paper consists of an annotated list 

 of the species of Pteridophytes and Spermatophytes found on the 



