The journal of the Horticultural Society of London . indicate that they have nothing to do with the otherfungus, and where both occur isolated from each other there isno difficvdty about the matter. Sometimes the spores of theSeptorella ooze out at once from the ruptured cuticle withoutany thing that might deceive; but occasionally the cellulartissue becomes a little tawny where it is raised up by the sub-jacent spores, which induced Madame Libert to assign a tawnyperithecium to the fungus, a very different thing indeed from theblack perithecia figured by Greville. When, however, this dis-colo
The journal of the Horticultural Society of London . indicate that they have nothing to do with the otherfungus, and where both occur isolated from each other there isno difficvdty about the matter. Sometimes the spores of theSeptorella ooze out at once from the ruptured cuticle withoutany thing that might deceive; but occasionally the cellulartissue becomes a little tawny where it is raised up by the sub-jacent spores, which induced Madame Libert to assign a tawnyperithecium to the fungus, a very different thing indeed from theblack perithecia figured by Greville. When, however, this dis-coloured tissue is removed, there is nothing like the regularcellular structure, which always exists in true perithecia. This factwas pointed out under Cytispora fugax, in the English Flora,in 1836, as completely established by Desmazieres under of his Plantes Cryptogames du Nord, though it seems tohave escaped the notice of later writers, and indeed he has him-self published since a host of species possessing beyond all doubta rrue Fig. 1 .—Portion of a patch of Gloeosporium concentncum, just after the spores have oozedout, magnifiod. Fig. 2.—Ditto where the irrouular cirrhi have subsided from moisture, magnified. Fig. 3.—Section of a leaf, from a firm part destitute ot lacuna?, showing the fungus occu-pying the space which ouglit to be occupied by the subcuticular cells, highly magnified. Fig. 4.—Spores and spornjhores, highly magnified. Fig. 5.—Spores, still more highly magnified, from a sketch by Mr. Broome. VOL. VI. 122 GLASS HOUSES. XI.—Glass Houses. By A. Forsyth, , St. MarysChurch, Torquay. (Communicated March 6, 1851.) The present seems an appropriate time to discuss the principlesof glass house building, the subject having been brought so pro-minently before the public by the great glass house in HydePark, and by the pamphlet lately published by Mr. Rivers,entitled the Orchard House, or, more properly, the orchardunder glass. Mr. R
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