. Introduction to cryptogamic botany. Cryptogams. INTRODUCTION TO CEYPTOOAMIC BOTANY. 373 the naked fruit as spermatia; in those he regards them as stylo- spores. But of this more hereafter. But besides these, there are abundant globular bodies of a vegetable green produced from the threads of the thallus. The origin of these has only very lately been studied. I had myself a good opportunity of ascer- taining their development from the threads of the mycelium, in specimens developed within the vessels of pine wood picked. rig. 78. a. Wood cell of White Spruce much decomposed, filled with myce-
. Introduction to cryptogamic botany. Cryptogams. INTRODUCTION TO CEYPTOOAMIC BOTANY. 373 the naked fruit as spermatia; in those he regards them as stylo- spores. But of this more hereafter. But besides these, there are abundant globular bodies of a vegetable green produced from the threads of the thallus. The origin of these has only very lately been studied. I had myself a good opportunity of ascer- taining their development from the threads of the mycelium, in specimens developed within the vessels of pine wood picked. rig. 78. a. Wood cell of White Spruce much decomposed, filled with myce- lium of Parmelia parietina, bearing gonidia. b. Spermatia on fertile threads of Umhilicaria pustulata. c. Ditto of Uroeolaria calcarea. d. Ditto of Urceolaria cinerea. All highly magnified. The three latter after Tulasne, to whose trea- tise on Lichens, in Ann. d. Sc. Nat, 1852, every writer on the subject must be deeply indebted, and of which I have largely availed myself. e. Threads and spermatia springing from wall of spermatogonium of Borrera ciliaris. From a sketch by Mr. G. H. Hofiinan. up by Captain Inglefield in the arctic regions, and figures have lately been published by Speerschneider in the Botanische Zeitung for 1854.* In many Lichens these bodies obtain access to the external air by means of rents in the upper surface, of more or less regularity, and are washed off after losing a little of their vivid colouring. The colour origin- ally is always green, but it is modified by external circum- * According to his observations they spring partly from the medul- lary layer, and partly from the tissues with which it is in immediate Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Berkeley, M. J. (Miles Joseph), 1803-1889. London, New York, H. Bailliere; [etc. ,etc]
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