. A handbook of cryptogamic botany. Cryptogams. ASCOMYCETES 371 generally somewhat precedes the origin of the carpogone. Under the surface of the thallus a hypha not distinguishable from its neigh- bours gives oif a broader lateral branch, which coils itself up two or three times, and then sends forth the tip of the coil, which, growing upward, emerges through the surface of the thallus into the open. The tube is commonly somewhat swollen as it passes through the superficial tissue, and for some short distance above it, and attains a height above the surface of four or five times its breadth.
. A handbook of cryptogamic botany. Cryptogams. ASCOMYCETES 371 generally somewhat precedes the origin of the carpogone. Under the surface of the thallus a hypha not distinguishable from its neigh- bours gives oif a broader lateral branch, which coils itself up two or three times, and then sends forth the tip of the coil, which, growing upward, emerges through the surface of the thallus into the open. The tube is commonly somewhat swollen as it passes through the superficial tissue, and for some short distance above it, and attains a height above the surface of four or five times its breadth. This is the trichogyne. The coil as it grows is divided by transverse walls into about a dozen thin-walled cells, and the trichogyne likewise into a similar number. Its development having taken place, and the suitable conditions of moisture having dispersed the pollinoids over the surface, these, wher-. FiG. 307.—A-, LeMogium tnicrophyllutn Ach., section of thallus. a, point of trichogyne; g, algal cells ; «, hyphae. B, Coltema. jntlposum Bernh., young carpogone. C, tricho- gyne with pollinoids of L, microphyllum. D, a similar one showing union with polli- noid. (,A X 350, B,C,D -n. 750.) (After Stahl.) ever they come into contact with a trichogyne, stick to it, sometimes in considerable numbers, and an open communication between pollinoid and trichogyne is established by means of a short minute process from the pollinoid. When this has been accomplished the cells of the trichogyne collapse, remaining distended only where a transverse septum occurs in its course, while the cells of the coil increase in volume and in number through the growth of fresh transverse walls. The neigh- bouring thallus-hyphae then give out numerous shoots, which not only grow round the coils, but press them asunder. The hyphse on the side next the surface then give off branches in that direction, the end shoots of which form the first paraphyses, after displacing the intervening tissue in their cour
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