44 SCIENCE PROGRESS 



Polyangium is proposed, includes H. shorensis, H. tiliceoides, 

 H. Lomaxi, and probably H. punctatum, H. Renaultii, H. 

 Duchartrei and H. bibractense. 



The three first-named, and probably the latter species also, 

 agree in exhibiting a leaf trace which starts from the stele 

 as two distinct bundles which divide to form four or more 

 strands in the petiole. The protoxylem groups tend to be 

 pronouncedly exarch, and are more distinct than in the other 

 species. 



The second sub-genus, Eu-Heterangium, probably repre- 

 sents the older type, and includes H. minimum, H. Grievii, 

 H. alatum, H. polystichum, H. Schusteri, and H. Sturii. These 

 are characterised by less distinct protoxylem bundles, either 

 centrally mesarch or with a tendency towards exarchy. The 

 leaf-trace here starts as a single strand which either remains 

 undivided or only forms two bundles in the petiole. H. 

 Andrei appears to combine the features of the two sub-genera, 

 a feature all the more interesting in view of the intermediate 

 character of this species as between typical Heterangiums and 

 the genus Lyginopteris. 



The occasional presence of ray tracheids in the secondary 

 xylem of Quercus alba, similar to those of Pinus, is noted by 

 S. J. Record in the Botanical Gazette (Nov. 191 7). 



Mrs. Arber {Annals of Bot. Jan. 19 18) records interfascicular 

 cambium in A corns calamus, Tamus communis, Tritonia sp., 

 Potamogeton natans, Ophiopogon japonicus, Phormium tenax, 

 and Veratrum album. 



Taxonomy. — In the Journal of Botany for November 191 7, 

 W. Watson describes a new lichen from the Carboniferous 

 Limestone of Ebbor Gorge, Somerset, viz. Staurothele ebborensis. 



A number of new species belonging to the genera Drimys, 

 Garcinia, Elceocarpus, Eugenia, Rondia, Lobelia, Pratia, Melo- 

 dinus, Bulbophyllum, and Freycinetia, are described from 

 Bellenden-ker, North Queensland, by Spencer Moore. In 

 the same journal for December, Dr. Wernham contributes 

 further descriptions of Tropical American Rubiaceae. These 

 include new species of Psychotria and Palicourea, and the 

 description of a new genus Raritebe belonging to the tribe 

 Hamelicae. 



Further new species from the African collections of Arch- 

 deacon Rogers are described by Spencer Moore (Jan. and Feb. 



