﻿I**] ON A NEW SPECTES OF APOCYNACE/E FROM FORMOSA. 51 



Plate IV. 



Fig. 5. Large sori of the fungus on a carpellary leaf. Nat. size. 



Cross section of the sori on a diseased leaf. Under the sori 



numerous accessory veins are produced. Slightly magnified. 



Cross section of a sorus through its peripheral portion. x 250. 



Spermogonjum. x 250. 



Cross section of the cortex of an infected branch of the host. 



m, perennial mycelium, h, haustorium. x 350. 



Normal leaf. Nat. size. 



Diseased leaf with enlarged stipules. Nat. size. 



Fig. 



6. 



Fig. 



7. 



Fig. 



8. 



Fig. 



9. 



Fig. 



10. 



Fig. 



11. 



On a New Species of Apocynaceee from Formosa. 



by 



B. HAYATA. 



Assistant in the Botanical Institute, Science College, 

 Imperial University of Tokyo. 



The following interesting plant was kindly given to me by Mr. T. 

 Kawakami, Government Expert of Formosa. It was obtained by him at 

 Shinko in the northern part of the island. He remarks that this tree is 

 of great industrial value, on account of its milky juice which forms one 

 of the kinds of Caoutchouc. 



Ecdysanthera utilis Hayata et Kawakami. Frutices scandentes 

 glabri. Folia opposita, elliptica, basi apiceque acuminata, 5-6 cm. longa, 

 3-3J cm. lata, subtus pallida remote pennivenia, venis utrinque 5-6, longe 

 petiolata, petiolis 2-3 cm. longis. Cyme laxse pubescentes, trichotomy, 

 ad apices ramorum paniculate, 7-8 cm. longae. Fiores parvi, patentes 

 3 mm. in diametro sequantes, flavescentes. Calyx parvus 1mm. longus, 

 extus pubescens, 5-fidus, lobis triangnlaribus obtusis, basi intus glandulosus, 

 glandulis brevibus cum lobis calycis alternis. Corolla suburceolata, tubo 

 1.5 mm. longo ovoideo-campanulato, fauce intus pubescenti collosis cum 

 lobis alternis ; lobis 5, rotundato-truncatis basi breve angustis 1 mm. 

 latis brevibus leviter mucronatis latisque contortis dextrorsum obtegentibus. 

 Stamina basi corolla3 affixa, inclnsa, filamentis brevibus ; antherse lanceolato- 

 sagittatre, 1^ mm. longaa, acuminate, circa stigma conniventes, loculis basi 

 in appendiculas vacuas longas product-is. Discus annularis, 5-lobus. Ovarii 



