ROUND TRIP BETWEEN IOWA AND PUGET SOUND. 179 



osa, Iriclea laminarioides, Fauchea gardneri, Pryonltls lyallii, 

 lihahdonia coulteri, Egregia menziesiij, Alaria cordata and Cera- 

 mium calif ornicum are species frequently seen and of more or 

 less special interest. This somewhat laborious list has some 

 value at least in that it represents forms that may be easily found 

 and readily determined with good keys and herbarium speci- 

 mens, by one pressed for time and not very familiar with marine 

 plants. 



Finally, brief mention may be made of the group of plants 

 on which the writer spent most of his time. After studying the 

 lichen flora of the islands until new lichens were picked up very 

 slowly, except in a few favored places, it does not appear that the 

 lichen flora is an especially rich one. The work thus far done on 

 the collection would indicate that the whole number of species 

 collected is not far from two hundred, which is a rather small 

 number for the time spent in collecting. The lichens of the 

 various islands are very similar, except for a few very conspicu- 

 ous exceptions due to difterences in substrata or elevation. F<;>r 

 instance, the limestone at Roche Harbor furnished a few licliens 

 characteristic of such substrata, and the sandstones of Waldron 

 Island were found to be exceedingly interesting after the other 

 rocks of the islands had been examined carefully. The soil over 

 the sandstones of Waldron Island was also found to be especially 

 interesting, so that the higli areas examined on this island jn-oved 

 most fruitful toward the close of the collecting season when 

 lichens new t<;) the collection were not easily found. The top of 

 Mount Josephine furnished Chidonia cocci f era, Cladoiiia hell hi i- 

 fora, Cladonia gracilescens, elongated forms of Cladonia gracilis, 

 Thamnolia vermicularis, Alectoria sarmentosa and peculiar 

 forms of Cetraria glauca, all of which are very rare or entirely 

 absent at lower elevations on the islands. The collecting here 

 ])roved that the elevation of 2,409 feet brings undoubted differ- 

 ences in lichen flora. It may be mentioned also that the only 

 place where Spliaerophorus glohiferus was found in fruit was on 

 the hemlocks near the top of Mount Constitution. Phi/sciaf^ aurl 



