. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . to Europe is Phycopeltis epiphyton Mill. (fig. 203 A—(7), whichhas been found as an epiphyte on the leaves of Abiespectinata, Hedera Helix and Rubus species of Phycopeltis and Cephaleuros occur mostly in the damp tropical and sub-tropical forests of both the New and Old Worlds. 310 Ulotrichales Cephalevros virescens Kunze ( = Mycoidea parasitica Cunningham) is a parasite on theleaves of Camellia, Mangifera, Rhododendron, Thea, Croton,
. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . to Europe is Phycopeltis epiphyton Mill. (fig. 203 A—(7), whichhas been found as an epiphyte on the leaves of Abiespectinata, Hedera Helix and Rubus species of Phycopeltis and Cephaleuros occur mostly in the damp tropical and sub-tropical forests of both the New and Old Worlds. 310 Ulotrichales Cephalevros virescens Kunze ( = Mycoidea parasitica Cunningham) is a parasite on theleaves of Camellia, Mangifera, Rhododendron, Thea, Croton, and various Ferns. InNorth-east India and Assam it causes the Red Rust of Tea, the most serious diseaseto which the tea-plant (Thea sinensis) is liable in that part of the world, and it is as astem-parasite that it is so destructive (Mann & Hutchinson, 04 ; 07). The parasiteoccurs on both leaves and young shoots (fig. 203 D and E), the latter being mostlyinfected by zoogonidia from the fructifications of the algal thalli on the leaves. Theyoung shoots are particularly susceptible to attack owing to the rough character of the fPt m ts ^z-m^m^. Fig. 203. A—C, Phycopeltis epipliyton Millard. A, medium-sized thallns, with the cells inoutline only; the five represented with double lines are empty zoogonidangia; B, smallportion of thallus to show division of peripheral cells ; C, zoogonidium. D—F, Cephaleurosvirescens Kunze. D, part of leaf of tea-plant with an epiphytic lichen (I) and the parasiticAlga (a) ; E, tea-shoot attacked by Alga (a) • F, part of transverse section of tea-leaf showingthe penetration of the Alga into the leaf; the algal cells are shaded. A, x 300; B and C,x 900 (after Millard from Wille); D and E, natural size ; F, x about 60 (after Mann &Hutchinson). bark, in the crevices of which the zoogonidia come to rest and germinate. The parasiteis only disastrous in its effect when, owing to want of vitality in the plant attacked, thegrowth of the Alga i
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