222 THE JOURNAL OF BOTANY 



are smooth, but later the central cells become muriculate and 

 appear as if covered with black dots ; sometimes all the cells 

 become so, but usually the end cells of a section remain smooth 

 and paler than the others. Can this be the final, most developed 

 stage of H. s;plendcns ? 



250. Acrotheca acuta sp. n. 



Hyphis conidiiferis confertis, at non fasciculatis, erectis, brevi- 

 bus (ca. \ mm. altis), simphcibus, basi subbulbillosis, inferne 

 pauciseptatis, nodulosis, irregularibus 2|-3 /x cr., dilute fuscis, 

 sursum dilutioribus. Conidiis ad apicem congestis, paucis, pro- 

 pemodum hyahnis, elliptico-fusoideis, superne rotundatis, deorsum 

 attenuatis, 9-10 x 21 /x, distincte stipitellatis et denticulis exiguis 

 affixis. (Tab. 543, fig. 9.) 



In ligno decorticate stipitis vetusti Urticce, dioicce, basin versus, 

 atque in ipsis Le2Jtos2)hceri(B acutcd peritheciis ei agnatis, Hereford, 

 Maio. 



The fact that this grew all over the outside of many of the 

 perithecia of the Le2:)tos2Jhceria, as well as on the wood surrounding 

 them, might suggest that it is a conidial stage of that species ; on 

 the other hand many of the neighbouring perithecia were quite 

 free from it, and I have never met with it before among the many 

 thousands of perithecia of L. acuta which I have examined. I 

 bequeath the task of considering and disproving this suggestion to 

 younger men with more leisure than I possess. The affected peri- 

 thecia looked at first sight as if they belonged to a species of 

 Lasiosphceria. 



251. Syncephalis intermedia Van Tiegh. in Ann. Sci. Nat. 

 1875, p. 127, figs. 110-5. 



Mycelium very delicate, hyphae forked, not 1^ /x broad; 

 sporangiophores erect, standing singly, but gregarious, yellowish, 

 about f mm. high, 20 /x broad, slightly swollen below, clavate 

 above, head about 40 /x broad, the upper half covered with little 

 rounded warts when mature, filled with a yellow protoplasm. 

 Sporangia cylindrical, fasciculate as in As2Jergillus, but all tending 

 upwards, about 75 x 3 /x when young, many arising two or even 

 three together on an irregular or rather cordate basal cell. Spores 

 oblong, obtuse, 6-12 x 5 //, colourless at first, then sometimes 

 faintly brown and covered by the wrinkled wall of the sporangium. 

 Stylospores in rows, spherical, on short pedicels. At the base of 

 the sporangiophore, where it is slightly constricted, is a fascicle of 

 rhizoids (clamps) which are swollen at their insertion, then 

 tapering to the extremity, branched, and 1-3-septate. 



On crops of Mucor spp., on horse-dung, almost every year, 

 Birmingham, March. Eecorded from Leith Hill, Surrey, in 

 Trans. Brit. Myc. Soc. 1903, p. 31 ; see also Annals of Botany, 

 1902, xvi, 77, figs. 23-6. After originating on the Mucor, the 

 Syncephalis spread widely on the sides of the glass vessel in which 

 the crop was growing. 



252. Synchytrium sanguineum Schrot. Hedwig. 1876, xv, 134. 

 Sori of sporangia contained in compound warts (about | mm. 



