. Comparative morphology and biology of the fungi, mycetozoa and bacteria . Plant morphology; Fungi; Myxomycetes; Bacteriology. 434 SECOND PART.—MVCETOZOA. Delay may of course occur where the conditions are unfavourable. That the several species behave very diflferently in these respects is shown by the fact, that many of them, Trichia rubiformis, T. clavata and T. varia for example, are observed to form their sporangia almost entirely during a short portion of the yearly period of vegetation. The biological relations of most of the species require further examination. Section CXXII. The struc
. Comparative morphology and biology of the fungi, mycetozoa and bacteria . Plant morphology; Fungi; Myxomycetes; Bacteriology. 434 SECOND PART.—MVCETOZOA. Delay may of course occur where the conditions are unfavourable. That the several species behave very diflferently in these respects is shown by the fact, that many of them, Trichia rubiformis, T. clavata and T. varia for example, are observed to form their sporangia almost entirely during a short portion of the yearly period of vegetation. The biological relations of most of the species require further examination. Section CXXII. The structure of the mature sporophores is n all cases essentially the same as in the Ceratieae. The ripe sporangia in the majority of the endosporous genera, which show a great amount of variation in different species, must be described from a few of the typical forms, which have been known for some time. For special peculiarities the reader is referred to monographs and especially to that of Rostafinski. We must first distinguish between the simple sporatigium, which proceeds from one Plasmodium or from a part of one Plasmodium, and the aethalium, as Rostafinski understands that term, which is formed from large combinations of Plasmodia. I. It has been already said that the mature sporangia in most Myxomycetes are round or elongated, stalked or sessile vesicles one to a few millimeters high; less frequently, as in Didymium serpula, Trichia serpula and Licea flexuosa, P., they are cylindrical or flattened tubes forming a network and lying on the substratum. The wall of the sporangium is formed of a membrane which in constitution re- sembles the cellulose-membranes of plants. „„ ^ „., It is either a structureless hyaline and FIG. 189, Dtdymtutn squamuiosum, {D. ... leucafus, rr.) A ripe sporangium divided longitudinally SOmetimCS, ES in Dlachca and SOme SPCCiCS near the middle with the spores removed. Magn. about =5 'm«. of Physarum, an extremely delicate mem- brane, or it
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