Organography of plants, especially of the archegoniatae and spermaphyta . n exceptionalamount in Anomoclada mucosa \ which is covered with a thick envelope ofmucilage. Mucilage-organs may appear also in the thallose Hepaticae inthe guise of simple papillae. These appendicular organs of the thallusdeserve mention here, the more because their biological significance hashitherto received little notice, although the relationships between configura-tion and function are extremely evident. The series of the Marchantiaceae,of which we shall presently speak, supplies us with instructive illustrations.
Organography of plants, especially of the archegoniatae and spermaphyta . n exceptionalamount in Anomoclada mucosa \ which is covered with a thick envelope ofmucilage. Mucilage-organs may appear also in the thallose Hepaticae inthe guise of simple papillae. These appendicular organs of the thallusdeserve mention here, the more because their biological significance hashitherto received little notice, although the relationships between configura-tion and function are extremely evident. The series of the Marchantiaceae,of which we shall presently speak, supplies us with instructive illustrations. All thallose Jungerman-niaceae and Marchantieaehave at first appendicularorgans for the protectionof the vegetative statement thatthey are wanting in Mo-noclea is an error (seeFig. 4, ///), the result ofthe examination of un-favourable material. InRiccia crystallina- which,according to Leitgeb, pos-sesses no scales, I foundthem as very delicatestructures, but perhapsthere are some forms ofthis species where thescales are wanting, be-have overlooked them. Fig. 24. Blasia pusilla. I, vegetative point in longitudinal section ;7/, ainphigastriura with mucilage-papilla, e\ o, leaf-auricle with outerpapilla, /, as well as inner papilla, z; 00, papilla of the upper side of thethalius. II, similar section through a younger amphigastrium. Letter-ing the same, in, young leaf-auricle seen from above. After Leitgeb. cause an observer like Leitgeb would scarcelywere they present. JUNGERMANNIACEAE. Mucilage-papillae are of common occurrencein this group. In Blyttia and Morkia they are upon both sides of the thallus,in Metzgeria only upon the under side. They are simple and club-shaped inMetzgeria and Aneura, or the mucilage-secreting cell stands at the end of acell-row as in Morkia (Fig. 25, i), and this gives us a transition to the mucilage-organs arise in a definite order, for example, in Metzgeria. Blasia. The relationships in Blasia are somewhat peculiar and
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