These results tally well with those obtained by M. and Mme Moreau[616], though they make no mention of any trichogyne. They found that the terminal cells of the ascogenous hyphae were transformed into asci, and the two nuclei in these cells fused—the only fusion that took place. In _Nephromium_, one of the same family, the case for apogamy is not so clear; but Fünfstück found no trichogynes, and though spermogonia were present on the thallus, they were always somewhat imperfectly developed. Sturgis[617] supplemented these results in his study of other lichens containing blue-green algae. In species of _Heppia_, _Pannaria_, _Hydrothyria_, _Stictina_ and _Ricasolia_, he failed to find any evidence of fertilization by spermatia. _Solorina_, also a member of Peltigeraceae, was added to the list of apogamous genera by Metzger[618] and his work was confirmed and amplified by Baur[619]: certain hyphae of the gonidial zone branch out into larger ascogonial cells which increase by active intercalary growth, by division and by branching, and so gradually give rise to the ascogenous hyphae and finally to the asci. Baur looked on this and other similar formations as instances of degeneration from the normal carpogonial type of development. Moreau[620] (Fernand and Mme) have also examined _Solorina_ with much the same results: the paraphyses rise first from cells that have been produced by the gonidial hyphae; later, ascogenous hyphae are formed and spread horizontally at the base of the paraphyses, finally giving rise at their tips to the asci. Metzger[618] had further discovered that spermogonia were absent and trichogynes undeveloped in two very different crustaceous lichens, _Acarospora_ (_Lecanora_) _glaucocarpa_ and _Verrucaria calciseda_, the latter a pyrenocarpous species and, as the name implies, found only on limestone.