| Figure 1 | is a representation of the usually scattered positions assumed by the Goatsbeard Clustercups, Æcidium Tragopogonis (Puccinia hysterium). When infested it is usually found that nearly every leaf of the plant is thus spotted over with the fungus. The clustercups are bright orange in colour. The Anemone Clustercups, Æcidium leucospermum (Ochropsora ariae), posses a similar arrangement of the cups, but they are chiefly aggregated towards the edges of the leaves, and are, when growing on the leaf, a pure white. This scattered arrangement is found in Æcidium Epilobii (Puccinia pulverulenta), and numerous other clustercups. In Ranunculus Clustercups the cups are collected in more or less round patches, as is also the case with Barberry Clustercups. In nettles and some other plants, the parasite attacks the stalks, and has an injurious effect upon the sap, when the stalks become swollen and distorted. Other and various arrangements of position of clustercups on plants will be met with by the student.[return] |
| Figure 2 | represents a side view of two clustercups of Æcidium leucospermum (Ochropsora ariae). This view can easily be obtained by cutting a section across the leaf. In the Barberry Clustercup the fungus is much more elongated. The various species differ considerably as to what may be called the height to which they grow.[return] |
| Figure 3 | represents a section of Æcidium Grossulariæ (Puccinia caricina); from my cabinet, an admirable preparation by John Barrow Esq., of Manchester. The cup is partially open, and spores are rising to escape. We see but comparatively few spores, as doubtless a large quantity of them would escape during the preparation of the object.[return] |
| Figure 4. | This represents the postiton of Ræstelia cornuta (Gymnosporangium cornutum), as seen upon the leaf of mountain ash. Other species of Ræstelia vary as to the position they assume on the plant. The one on the hawthorn, Ræstelia lacerata (Gymnosporangium clavariiforme), generally distorts the smaller twigs. [return] |
| Figure 5 | represents a fragment of Peronospora infestans (Phytophthora infestans), copied from a slide in my cabinet. The spores of the different members of the genus differ somewhat as to the mode of their arrangement, as also in size and shape.[return] |
| Figure 6 | represents Ærisiphe lamprocarpa (Erisyphe sordida), a fungus found upon various plants, amongst them Salsify, Scorzonera and Plantain. It belongs to a very interesting group of microscopic plants, with radiating appendages, all worthy of careful study, and some of singular beauty.[return] |
| Figure 6a | represents an ascus or fruit-bearing vessel of Ærisiphe lamprocarpa (Erisyphe sordida), with its two sporidia as usually seen. [return] |
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