366 Bryoph3'-ten. — Floristik, Geographie, Systematik, etc. 



for the district. Among them is Dicranella secunda Lindb., an addi- 

 tion to the flora of West Yorkshire. A. Gepp. 



Cheetham, C. A., Mosses, etc., at Horton-in-Ribblesdale. 

 (The Naturalist. N". 617. June 1908. p. 201—202.) 



The author gives some field notes upon the more interesting 

 mosses observed during an excursion of the Yorkshire Naturalists 

 Union; the luxuriance of the species observed on the limestone in 

 Ling Gill; the very restricted flora on the gritstone scars of Pen- 

 nyghent; the rarities in Douk Gill. A list of eight species new 

 to the district is added. A. Gepp. 



Cockburn, B., Note on Petalophyllum Ralfsii and Pallavicinia 

 hibernica. (Transactions and Proceedings of the Botanical Society 

 of Edinburgh. Vol. XXIII. p. 279— 280.{a907.) 



A Short note on the distribution of Pallavicinia hibernica and 

 the rare and inconspicuous Petalophyllum Ralfsii in Britain, and 

 on the conditions under which they occur, namely in salt marshes 

 near the sea. The two plants sometimes grow together. A. Gepp. 



Hitchcock, A. S., Types of American grasses. (Contr. U. S. 

 Nation. Herb. XII. p. 113—158; with index, I-IV. June 18, 1908.) 



An exhaustive and careful study of the American grasses descri- 

 bed by Linnaeus, the grasses of Gronovius's "Flora Virginica", 

 the grasses of Sloane's "Histor}^ of Jamaica", the West Indian gras- 

 ses described by Swartz, and the grasses of Michaux's "Flora 

 Boreali-Americana". The advised changes from names currently in 

 used are alphabetized at end of the paper, and the following new 

 names are proposed: Brachiaria Mesiana, Erianthns divaricatus {An- 

 dropogon divaricatuni L.), Eriochloa Michauxii {Paniciim molle Michx.), 

 Melica purpiirascens [Avena stuata Michx.), Orysopsis pungens {Mi- 

 lium pungens Torr.), Panicidaria nielicaria {Panicuni melicavium 

 Michx. Panicum Swavtsianum {P. lanatian Sw.), Seniles Zeugites 

 Nash.), {Apluda Zeugites L.), Sporobolus clandestinus {Agrostis clan- 

 destina Spreng.), Spartina Michauxiana {Trachynotia cynosuroides 

 Michx.), and Syntherisma digitata {Milium digitatum Sw.), all attri- 

 butable to the author unless otherwise noted. Trelease. 



House, H. D., The North American species of the genus 

 Ipomoea. (Annais N. Y. Acad. Sei. VIII. p. 181—263. May 11^ 1908.) 



Keys to three sections, comprising 19 subsections, and 175 spe- 

 cies, of which the following are newly named: Ipomoea duran- 

 gensis, I. ancisa, I. lenis, I. invicta, I. areophila, I. Lindheimeri 

 subintegra, I. heterophylla subcontosa, I. heterophylla aemula, I. 

 comosa (/. villosa Meissn.), /. desertorum, I. Vahliana {Co)wolvidus 

 acuminatus Vahl.), /. cissoides guadaloupensis (/. guadaloupensis 

 Steud.), /. iostemma, I. ignava, I. Faivccttii Urban, /. setosa cam- 

 panulata {Calonyction campanulatum Halber), /. setosa Pavoni (C. 

 Pavoni Halber), /. Hochstetteri {I. quinquefolia Hochstetter), /, plicata 

 Urban, /. popidina, I. praecana, I. sabulosa, I. sabidosa moUicella, 

 I. sabulosa hirtella, I. lacteola, I. passifloroides, I. rupicola, I. nicoyaiia, 

 I. patens (/. capillacea patens Gray), /. seducta, I. aprica (/. angusti- 

 folia Chois}^, /. sagittida, I. rhomboidea, I. phillomega [tonvolvulus 

 phillomega VelL), /. Purpusi, I. trifida ymalensis, I. tuxtlensis, I. 



