NO. 4 



MEXICAN MOSSES THERIOT 



15 



hasi 60 /x, perciirrente vel breviter excedente ; rete opaco, papilloso. 

 jiapillis densis, minutis, cellulis quadrato-hexagonis, 8-9 /x, cellulis 

 basilaribus laxioribus, hyaUnis, rectangularilius. Foba perichaetiaba 

 longiora (3 mm.) ; pedicebus erectus, pabidus, 5-6 mm. longus ; cap- 

 sula angvistissime cybndrica 1.5 mm. longa, 0.26 mm. crassa, annulata, 

 peristomium sub ore insertum, dentes bneares, integri. tenuiter pa- 

 pibosi ; sporae laeves, 12 /x crassae. Calyptra? Opcrcibum? 



Comparable to JV. stoniafodoiita (Card.) Brotb. in form and size 

 of capsule, but very different in its autoicous inflorescence, longer, 

 more narrowly acuminate leaves (witb margins not involute), looser 

 basal areolation. and entire peristome teetb. 



Furtbermore, does Cardot's species, wbicb bas tbe peristome teetb 

 divided into two brandies, really belong to tbe genus ll'eisiopsisf 



DIDYMODON (Erythrophyllum) PATENTIFOLIUS Ther., sp. nov. 



Valle de Mexico: Xoquiapan (Bro. Ainablc 1676); Mixcoac 

 (ArsciJC 9442). 



Dioicus, tenellus, obscure viridis. Caulis erectus, simplex, vix 

 2 mm. altus. Folia sicca crispula-patula, bumida patentia, carinato- 



FiG. 9. — Didymodon pafcutifoliiis Ther. i, 2, cauline leaves; 3, median cells; 

 4, basal cells; 5, 6, cross-sections in acumen; 7, cross-section of costa near 

 base; 8, perichaetial leaf; 9, dry capsule; 10, moist capsule; 11, peristome; 12, 

 fragment of peristome. 



concava, lanceolato-bgulata, acuta, marginibus anguste revolutis, in- 

 tegris, 1. 5-1. 6 mm. longa, 0.3 mm. lata; costa papillosa, basi 60 /x 

 crassa, percurrente ; cellulis laminae hexagonis, cbloropbyllosis, obscu- 

 ris, papulosis, 8-9 /x, basilaribus laxis, byabnis, teneris, oblongo-bexa- 

 gonis, vel rectangularibus. Folia pericbaetiaba similia sed majora, 



