APPENDIX. 



The following appendix contains descriptions of additional species 

 found within the area covered by this Manual, and of species made known 

 from investigation, during the two years that the first edition of this 

 book was in press and during the three years since it was published. 

 Several species proposed by various students have not been admitted, as 

 they appear to require further investigation before their status can be 

 satisfactorily established. A few corrections are also noted. 



P. 24, add: 



ia. Lycopodium porophllum Lloyd & Underw. Rock Club-moss. Pros- 

 trate portion of stems short, abundantly rooting, curving upward, then 

 dichotomously branching 1-3 times to form a rather dense tuft (4-10 cm. 

 high) of vertical stems, densely clothed with spreading or reflexed leaves; 

 leaves (7-9 mm. X 1 mm.) very slightly broadened above the middle and 

 similarly contracted toward the base, those between the strobilar regions 

 shorter (6-7 mm.), broadest at the base but very gradually tapering, entire 

 or very minutely denticulate; sporangia compressed-reniform; sporophylls 

 minutely denticulate above the middle or entire, acuminate (4-5 mm. X 

 1 mm. wide at base) ; plant often gemmiparous. Differs from L. lucidulum 

 in its nearly linear entire leaves and smaller size, and from L. Selago in 

 the bases of its leaves, which are flattened. On sandstone rocks, Wis., 

 Ind. and Ala. 



P. 25, add: 



3a. Lycopodium Chapmanii Underw. Chapman's Club-moss. Stems 

 prostrate and frequently rooting or slightly arching and rooting toward 

 the end, 18-40 cm. long, simple or occasionally pinnately branching, thick 

 (about 3 mm. in diameter) ; leaves 6-7 mm. long by 2 mm. broad, thick, 

 rigid, lanceolate-acuminate, upwardly curving, the margin irregularly 

 toothed, the teeth often compound below the middle of the leaf; peduncles 

 10-25 cm. long, slender, leafy with more or less appressed subulate- 

 toothed leaves below and similar entire leaves above; strobiles about 3 

 mm. in diameter and 1.8-7 cm. long; sporophylls 1 mm. X 5-6 mm. with 

 a broad base, suddenly contracted above into a narrow subulate apex, 

 usually more or less toothed near the base; sporangia subglobose. Dif- 

 fers from L. mundatum by its much thicker stems, toothed leaves, tall 

 peduncles, and long narrow strobiles. Mass. to Fla. and La., mostly near 

 the coast. 



P. 26, at end of description of Lycopodium complanatum, strike out th- 

 last sentence commencing with " Forms with ". and add: 



12. Lycopodium tristachyum Pursh. Creeping Christmas-green. 

 Rhizomes extensively creeping 2-4 cm. below the surface of the ground, 

 white, terete, their whorled or loosely spirally arranged leaves lanceolate 

 or ovate to broadly ovate; the terminal branchlets regularly producing 

 innovations the second and sometimes the third season, the older foliage 

 branches ultimately spreading and becoming lax; leaves of the primary 



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