ZOOLOGY AND BOTANY, MICKOSCOPY, ETC. 235 



together with his pencil sketches and photographs of microtome sections, 

 are published posthumously. The species studied were Lygodium 

 scande?is, L.japonicum, L. dichotomum, L. voliihile, Davallia fumarioides. 

 The summary supplied by the editors states: — 1. Bertrand and Cornaille's 

 interpretation of the petiolar trace of Lygodium, as derived by the union 

 of the inverse folds of the metaxylem of a C-shaped trace, is confirmed. 

 2. In Lygodium japonicum the dorsal protoxylem of the petiolar trace, 

 consisting of annular or spiral elements, is not exarch but mesarch, 

 being more or less completely enclosed by centrifugal metaxylem. 3. In 

 the petiolar trace and branch-traces of Davallia fumarioides all stages 

 between the open C-shaped trace and the condition present in Lygodium 

 are found. 4. In this condensation of the C-shaped trace of Davallia 

 fumarioides the adaxial hooks of xylem completely disappear. It may 

 be inferred that they are absent in the trace of Lygodium also. 



Prothallus of Phylloglossum.* — K. Sampson gives an account of 

 a young sporeling of Phylloglossum attached to a prothallus, and 

 possessing a single leaf 8 mm. long, a slender root and a small storage 

 tuber. The prothallus, about 2 mm. diameter, was of a relatively 

 unspecialized type, and its notable feature was the presence of fungal 

 hypha3. The hyphtewere of two sorts : 1. Coarse, non-septate, probably 

 saprophytic, hyphse among the outer layers. 2. Slender, septate and 

 frequently coiled hyphEe, abundant and endophytic in the central region 

 of the prothallus. Some traces of an immature antheridium (?) were 

 found. As regards that part of the sporeling which was found in 

 contact with the prothallus — the embryonic swelling — it remains an 

 open question whether it be a foot or a protocorm ; but the presence of 

 both an embryonic swelling and a characteristic storage tuber indicates 

 that Phylloglossum falls into line with one or other of the Lycopodian 

 series possessing an embryonic swelling {Lycopodium clavatum or 

 L. cernuum), and that the annual storage tuber is of entirely independent 

 origin. 



Bryophy ta. 



(By A. Gepp.) 



Mnium antiquorum.t — H. K. Dixon gives an account of Milium 

 anfiquorum, an extinct moss found by the late Clement Reid among' 

 plant-remains obtained from the Pliocene deposits at Reuver, in the 

 valley of the Maas on the border-line between Limburg and Prussia. 

 These plant-remains show a remarkable affinity with the present flora 

 of China and Japan. Fragments of two mosses were separated out, one 

 closely related to Porotrichum alopecuroides, an East Asiatic species with 

 an intra-marginal leaf-border ; and the other belonging to Mnium sect. 

 Trachycystis, and constituting a new species, M. antiquorum Card, and 

 Dixon, the only allies of which are confined to East Asia. The 

 structure of the leaves is figured. 



* Ann. Bot., xxx. (1916) pp. 605-7 (figs.), 

 t Bryologist, xix. (1916) pp. 61-2 (figs.). 



R 2 



