On the Structure and Habits of the Orobanchaceae. 29 



Sphseria concentrica. Ustilago Salveii, Berk. MSS, On 



Myriangium Duriaei, Berk. 8f Mont. young plants of Dactylon glome- 



On ash-trees in Sark. ratus. St. Martin's. 



Phoma asteriscus. On Heracleum in Uredo compransor. 



Moulin Huet Bay. Petroselini. On Slum lati- 



Dothidea ulmi. folium. 



rubra. caricina. On Cyperus longus. 



Lycoperdon gemniatum ; e. furfura- bif'rons. On Rutnex obtusifo- 



ceum. lius. 



Scleroderma vulgare. ranunculacearum. 



Evysiphe communis. lubigo. 



Oidium moniloides. cylindrospora. 



Aregma bulbosum. polygonorum. 



Puccinia graminis. Rosae. 



polygonorum. caprearum. 



lychnidearum. leguminosarum. 



Cotyledonis. Candida. On Lepidium latifo- 



violarum. Hum. Grand Cubo. 



Fabae. primulae. 



prunorum. hypericorum. 



iEcidium Bunii. trifolii, Di?c.apiculosa,/>/f. On 



laceratum. Medicago denticulata. 



primulae. . On Lotus hispidus. 



rubellum. . On pea leaves — not ap- 



ranunculacearum. pendiculosa — a very hand- 



Periclymeni. FermaiiiBay. some species. 



Depazea Caricae. On the leaves of Scillarum. 

 the common fig-tree. Berk. MSS. 



IV. — On the Structure and Habits of the Orobanchacese. 

 By Arthur Henfrey, F.L.S. 



The discovery by Mr. Mitten of the parasitism of Thesium, and 

 the extension of the same character among the. Uhinanthacese 

 pointed out by M. Decaisne, have given additional interest to the 

 study of parasitical plants, and I take advantage of an opportu- 

 nity I had last summer of examining our two common species of 

 Orobanche, rapum, Thuill., and minora Sutt., to call attention to 

 some points connected with their structure and mode of growth 

 which do not appear to have been noticed. 



M. Duchartre published in the ^ Ann. des Sc. nat.^ Sept. 1843, 

 an account of the anatomy oi Lathrcea clandestina, Linn., and in 

 the ' Ann. des Sc. nat.' Aug. 1845 of Orobanche Eryngii, Vauch. ; 

 and in the 'Ann. des Sciences nat.^ for Sept. 1847, M. Lory 

 relates the results of his observations on the structure and phy- 

 siology of Orobanche Teucrii, Holl et Schultz., Galii^ Duby, 

 major, L., brachysepala, Schultz., and cruenta, Bert., which, as 

 far as they go, agree with what I have noticed in Orobanche 

 rapum and minor. 



The stems of these plants present in a cross section a veiy 



