1920] WILSON, FOUR NEW CONIFERS FROM KOREA 187 



Arbor gracilis, 6-9-metralis, trunco 0.5-075 m. in circuitu, cortlce tenui, 

 squamoso, purpureo-brunneo (chocolate-brown), coma anguste pyramida- 

 lis, vel saepius frutex ramis patentibus, habitu indistincto, ramis sparsis 

 decumbentibus, rarius horizontaliter patentibus, apice ascendentibus; 

 ramuli applanati, frondosi. Folia compressa, in turionibus triangularia 

 vel triangulari-ovata, acuminata, dorso glandulifera, demum brunnescentia 

 et ad quartum annum persistentia, ea raraulorum lateralium deltoidea vel 

 obdeltoidea vel rhomboidea, acutiuscula vel obtusa, supra lucide viridia et 

 glandulifera, subtus glauca. Strobili erecti, ovales, circiter 1 cm. long! et 

 6 mm. diam., avellanacei; squamae tenues, 6, paria duo inferlora fertilia, eae 



supenons 



puberul 



paulo infra apiceni mucrone leviter recurvo nigrescente instructae; semina 

 ala inclusa ovalia, 4 mm. longa et 2.5-3 mm. lata, profunde emarginata, ut 

 videtur 10 in sirobilo quoque.^ 



Korea : prov. Kogen, Kongo-san, summit of Miroku-ho, alt. 1500 m., October 12, 

 1917, E. H. Wilson (No. 9244, tj-pe); same locality, alt. 1000-1.500 m., July 6, 1918, 

 E. 11. Wilson (No. 10,481); same range of mountains, round Hermitage, alt. 800- 

 1000 m., September 13, 1918, E. H. Wilson (No. 10,725); prov. North Heian. near 

 Kanin, alt. 1200-1300 m., September 11, 1917, E. H. Wilson (No. 9138); same pro- 

 vince, near Nanshatongu, September 1, 1917, E. H. Wilson (No. 9088) ; prov. South 

 Kankeyo, Laoling-san, middle and upper slopes, alt. 1000-2000 m., September 17, 

 1917, E. B. Wilson (No. 9175). 



This is a very interesting addition to the genus and is remarkable in its 

 variation in halut from a sprawling shrub of nondescript shape to a slender, 

 graceful, narrow-pyramidal tree. The Japanese species {T. Standishzi 

 Carr.) to which it is most closely related and with which it has been con- 

 fused by Komarov and others, is always a tree and is sometimes as much as 

 17 meters tall with a trunk 3.5 meters in girth ; its branches are never de- 

 cumbent, its leaves are uniformly smaller, less compressed, green on both 

 surfaces and the fruit is broader and of a more mahogany-brown color, and 



the cone-scales are thicker. 



The Korean Tluija is found on the middle and upper slopes of all the 

 higher mountains, except those of volcanic origin, from the Diamond Mts. 

 northward. * On many peaks of the Diamond Mts. it is abundant and is 

 especially so on Miroku-ho and in the descent of the Nemon-rei pass toward 

 Makaen-an Temple. Usually it forms an impenetrable tangle from 0.3-2 

 meters tall, but in sheltered ravines it is often a pretty tree from 1.5-3 

 meters tall and from 15-30 centimeters in girth of trunk. The wood is 

 moderately heavy, reddish brown with white sap-wood and is very fragrant. 



In forests its growth judging by the annual rings is very slow. Its habit of 



growth on the forest floor resembles that of Thujop.v's dolobrata S. & Z. 

 The foliage is very white below and often the whole plant has a decided 

 bluish appearance. The branches grow downward and outward and are 



1 When this number was already in page form 1 received a letter from Dr. Nakai inform- 

 ing me that he had described this Thuja in the November number of the Tokyo Botanical 

 Magazine under the name of Thuja koraiensis Nakai. 



