616 SUMMARY OF CURRENT RESEARCHES RELATING TO 



of a good supply of living material in all stages of growth. The genus 

 was first described by Radian in 1903, having been discovered in the 

 Bucegi range of the Roumanian Carpathians. It occurs also at a fVw 

 stations on the Polish and on the 1 [ungarian sides of the Tatra Mountains, 

 and some specimens have recently been found in the Vienna Hof -museum 

 which were collected thirty years ago. 



Notes on Riccardia and other Hepatics.* — V. Schiffner continues 

 his series of bryological notes, and treats of the following subjects : — 

 43. Riccardia sinuata v&r.stmoclada, a new variety recalling R.mvltifiila 

 var. major, but larger, thicker, more branched, etc. 44. The occurrence 

 of R. incurvata in Bohemia. 45. Peltolepis in the Balkan Peninsula. 

 46. Chomiocarpou quadratus, discovered in China. 47. Some new French 

 hepatics collected by Douin. 48. Bucegia romanica. 



Riella bialata.j — R. Trabut describes a new Riella from Algeria, 

 which is very remarkable for its two parallel wings, dorsally situated 

 and covering right and left the fructifications. It grows either out of 

 water and creeping, or immersed and erect. 



Thallophyta. 



Algae. 



(By Mes. E. S. Gepp.) 



Marine Diatomacese of France.^ — H. and M. Peragallo have just 

 completed their work on this subject, started eleven years ago. It was 

 issued to subscribers, according to their choice, in fascicles of four plates 

 each with explanations and text, or in sets of ten fascicles, or as a com- 

 plete work. It was also put on the market in three systematic sections ; 

 and finally it was published in the " Micrographe Preparateur," two plates 

 with text in each number of that periodical. In the preface it is stated 

 that the authors had the intention of producing a complete and entirely 

 original flora of the Diatornaceai of France, divided into three parts : — 

 1. A general treatment, comprising the natural history of diatoms, 

 methods of collection, cultivation, preparation, and their classification — 

 this part being destined to be published last of all. ' 2. A description of 

 the marine species, which is accomplished in the present work. 3. A 

 description of the fresh-water species, which presumably the authors will 

 now 7 proceed to take in hand. The species and forms are grouped in the 

 text into sections, tribes, families, genera, subgenera, etc., reference to all 

 of which is facilitated by means of synoptical tables. No such tables are 

 employed for the species and forms, since the plates themselves function 

 as the best possible synopsis, exhibiting the forms side by side and en- 

 larged to the same scale. This scale of magnitude is GOO diani., save in 

 the case of Plenrosigma and a few other genera. The drawings were all 

 made by camera-lucida, and photographed down to the standard size. 

 Each species or form is described, and references to all important litera- 



* Oesterr. Bot. Zeitschr., 1. (1908) pp. 8-12. 

 t Rev. Bryolog., xxxv. (1908) p. 96. 



X Diatoniees Marines de France. Grez-sur-Loing : Tempere, 1897-190S, 

 492 xii., and 48 pp. (137 pis.). 



